Finding the best coilover kits for Subaru STI involves balancing ride comfort, handling performance, and durability. The Rev9 Hyper-Street ONE stands out as the best overall for its versatile adjustability and compatibility, while the BC Racing BR Series offers extreme lowering for those seeking a custom look. On the other hand, some options prioritize comfort over aggressive handling, making them ideal for daily drivers. The main challenge is choosing between ride quality, ease of installation, and tuning flexibility. Continue reading for an in-depth comparison of these top coilover kits to help you make an informed decision.
Key Takeaways
- The most versatile coilovers offer a balance of adjustability and ride quality suitable for both street and track use.
- Premium brands like BC Racing provide advanced damping features but come at a higher price point.
- Lowering capabilities vary significantly, affecting ride comfort and clearance, which impacts daily usability.
- Adjustable damping settings are a key feature for fine-tuning handling, especially for aggressive driving or track days.
- Installation complexity differs; some kits are plug-and-play, while others require professional setup for optimal performance.
More Details on Our Top Picks
Rev9 R9-HPX-1027_2 Hyper-Street ONE Coilover Lowering Kit, Adjustable, Compatible With Subaru WRX STI (VA2) 2015-21
This coilover kit stands out for its 16 damping levels and upgrade spring rate, making it a flexible choice for drivers seeking a balanced setup. Unlike the BC Racing BR Series, which is more focused on extreme lowering, this kit provides a moderate drop (1.25 to 2.25 inches) suitable for daily driving. The mono-tube shock design enhances ride quality while maintaining control, but the lack of install instructions means it’s best suited for experienced technicians. Compared to the maXpeedingrods T7-Upgrade Series, this offers more damping adjustment options, but with the tradeoff of slightly higher cost. It’s ideal for enthusiasts who want a reliable, adjustable suspension that improves handling without sacrificing comfort.
Pros:- 16 damping adjustment levels for fine-tuning ride characteristics
- Moderate lowering range from 1.25 to 2.25 inches for daily usability
- Upgrade spring rates improve handling and ride comfort
- Compatible with various Subaru WRX STI models from 2015-2021
Cons:- No included installation instructions, requiring professional setup
- Limited warranty coverage (parts only)
Best for: drivers who seek a versatile, adjustable coilover kit suitable for street and occasional spirited driving
Not ideal for: beginners or those looking for a straightforward, no-fuss upgrade without tuning adjustments
- Spring Rate (Front):10 kg/mm (560 lbs/in)
- Spring Rate (Rear):8 kg/mm (448 lbs/in)
- Damping Levels:16
- Drop Range:1.25 to 2.25 inches
- Shock Design:Mono-Tube
- Compatibility:Subaru WRX STI VA2 2015-21
Bottom line: This pick makes the most sense for experienced enthusiasts wanting adjustable performance with moderate lowering.
maXpeedingrods Coilovers for Subaru WRX (STI) Sedan 2015-2021, Height Adjustable Coilovers Suspension Kit, Preset Damping Shock Absorber Struts, Lowering Kit Red
This coilover kit offers a height adjustable range of 1-3 inches and preset damping, making it an attractive option for those on a budget who still want noticeable performance improvements. Unlike the Rev9 Hyper-Street ONE, which provides more damping levels, this model simplifies tuning with factory preset damping, trading customization for ease of installation. The high tensile springs undergo rigorous testing, ensuring durability, but the limited damping adjustability might not satisfy those seeking precise control. Compared to the maXpeedingrods T7-Upgrade Series, it offers a more aggressive stance, though with less damping flexibility. This kit is ideal for street drivers who want a cost-effective way to lower their car with decent handling benefits.
Pros:- Affordable price point for a full coilover kit
- Adjustable ride height up to 3 inches for a more aggressive stance
- Rigorous spring testing ensures durability
- Easy to install with full kit included
Cons:- Limited damping adjustment options, only preset levels
- Less precise handling compared to multi-level damping systems
Best for: beginners or budget-minded owners wanting straightforward lowering and basic handling improvements
Not ideal for: performance purists or drivers needing detailed damping tuning for track use
- Spring Rate (Front):10 kg/mm (560 lbs/in)
- Spring Rate (Rear):8 kg/mm (448 lbs/in)
- Drop Range:1-3 inches
- Damping Adjustment:Preset
- Spring Material:High tensile steel
- Application:Subaru WRX/ STI Sedan 2015-2021
Bottom line: This kit makes the most sense for street-focused users seeking an affordable, straightforward lowering solution.
maXpeedingrods Coilover for Subaru WRX and WRX STI Sedan 2015-2021, 24 Levels Damper Adjustable Coilovers Suspension Kit, Height Adjustable Shock Absorber Strut Lowering Kit, T7 Upgrade Racing Series
This coilover set offers 24 levels of damping adjustment, catering to drivers who want precise control from street to junior track use. Compared with the Rev9 Hyper-Street ONE, which emphasizes moderate lowering, this model provides a broader damping range, making it better suited for competitive or spirited driving. The upgraded T7 series shock oil maintains stability under various conditions, but the higher complexity may challenge amateurs. The spring rates are similar to other models, but the extensive damping adjustment makes it more versatile for different terrains. However, the slightly higher weight and potential for over-tuning mean it’s best for experienced tuners or serious hobbyists.
Pros:- 24 damping adjustment levels for fine-tuning
- Allows for both street and junior track use
- High-quality damping oil for stability
- Full height adjustment for aggressive stance
Cons:- More complex setup, requiring tuning experience
- Slightly heavier than simpler coilovers
Best for: performance drivers and track day enthusiasts seeking extensive damping control
Not ideal for: casual street drivers or those new to suspension tuning
- Spring Rate (Front):10 kg/mm (560 lbs/in)
- Spring Rate (Rear):8 kg/mm (448 lbs/in)
- Damping Levels:24
- Lowering Range:1-3 inches
- Shock Oil:Upgraded T7 series
- Application:Subaru WRX/ STI Sedan 2015-2021
Bottom line: This pick fits well for experienced drivers wanting maximum damping flexibility for varied driving conditions.
BC Racing BR Series Coilovers (Extreme Low) for the 2015+ Subaru STI/WRX
The BC Racing BR Series is designed for those who want extreme lowering and race-ready handling. Unlike the more street-oriented options like the Rev9 Hyper-Street ONE, this kit emphasizes maximum drop, which can be beneficial for track performance but may compromise daily ride comfort. The full adjustability makes it ideal for fine-tuning on the track, but the aggressive stance and lowered ride height could lead to increased ride harshness and alignment challenges on rough roads. Compared to the maXpeedingrods T7-Upgrade Series, it offers more adjustment and a lower stance, but at the cost of comfort and increased wear on suspension components. Best suited for dedicated track days or show cars.
Pros:- Maximum lowering capability for aggressive stance
- Full damping and height adjustment for precise tuning
- Ideal for track days and racing applications
- Durable powder-coated exterior for corrosion resistance
Cons:- Less comfortable for daily street use
- Potential for increased component wear and alignment issues
Best for: enthusiasts focused on achieving the lowest stance and maximum handling at the track
Not ideal for: daily drivers or those prioritizing ride comfort over extreme lowering
- Drop Range:Maximize lowering (extreme low)
- Damping Adjustment:Full (independent)
- Spring Material:Powder coated steel
- Application:Subaru 2015+ STI/WRX
Bottom line: This kit makes the most sense for dedicated track enthusiasts seeking extreme stance and tunability.
maXpeedingrods Coilover for Subaru Impreza WRX STI 2008-2014, 24 Levels Damper Adjustable Coilovers Suspension Kit Strut, Height Adjustable T6 Upgraded Lowering Kits Blue
This coilover kit is geared toward owners of older Subaru models, providing 24 damping levels and height adjustability for the 2008-2014 Impreza WRX STI. Compared to newer models like the Rev9 Hyper-Street ONE, it offers similar damping versatility but is tailored for the classic chassis, ensuring better fitment and compatibility. The T6 upgraded damper delivers reliable handling, but the weight of the kit and the slightly less refined damping oil may limit ultimate performance. Its spring preload and full aluminum plates enhance durability, but it’s primarily a street performance upgrade rather than a dedicated track setup. Ideal for owners wanting to preserve or restore their older Subaru with adjustable suspension.
Pros:- 24 damping adjustment levels for versatile tuning
- Full height and preload adjustment
- Durable T6 upgraded damper oil
- Compatible with classic Subaru models
Cons:- Heavier than more modern coilovers
- Less refined damping oil might limit high-performance use
Best for: owners of Subaru Impreza WRX STI 2008-2014 seeking adjustable suspension for street use
Not ideal for: performance drivers seeking maximum track tuning or extreme lowering
- Spring Rate (Front):8 kg/mm (448 lbs/in)
- Spring Rate (Rear):7 kg/mm (392 lbs/in)
- Damping Levels:24
- Height Adjustment:Yes
- Spring Material:T6 aluminum
- Application:Subaru Impreza WRX STI 2008-2014
Bottom line: This kit makes the most sense for owners of older Subaru models wanting adjustable, street-oriented suspension.
maXpeedingrods Coilover for Subaru Impreza WRX 2000-2007, for WRX STI GDB 2000-2004, for Subaru Forester 2003-2008, 24 Level Damper Adjustable Suspension Kit, Height Adjustable Lowering Kit Red
This maXpeedingrods coilover stands out for offering impressive flexibility across multiple Subaru models like the Impreza, Forester, and STI GDB, with 24 damper levels that suit both street and track driving. While it doesn’t quite match the precision of the Rev9 Hyper-Street II with its Mono-tube design, it compensates with height adjustability and robust twin-tube construction, making it ideal for drivers seeking a budget-friendly upgrade without sacrificing too much comfort. Compared to more expensive options, this kit provides a balanced blend of control and affordability, but it does involve some tradeoffs in damping finesse and long-term durability. The springs are high tensile and distortion is minimal even after extensive testing, giving confidence in its performance longevity. Overall, this kit is perfect for enthusiasts who want a reliable, adjustable coilover for daily driving and occasional spirited runs, especially if they prioritize value.
Pros:- Wide model compatibility across Impreza, Forester, and STI GDB
- 24 damper levels for customized control
- High tensile springs with minimal distortion after testing
- Adjustable height up to 3 inches for aggressive stance
Cons:- Twin-tube design offers less precise damping than mono-tube competitors
- Does not maintain original ride height, which may affect handling and comfort
Best for: Budget-conscious Subaru owners who want versatile, adjustable coilovers for street and occasional track use.
Not ideal for: Serious racers or those seeking top-tier ride quality with mono-tube damping and ultra-fine tuning, as this twin-tube isn’t as refined.
- Fitment:Subaru Impreza WRX 2000-2007, STI GDB 2000-2004, Forester 2003-2008
- Damper Adjustment:24 Levels
- Spring Rate:Front: 9 kg/mm, Rear: 7 kg/mm
- Height Adjustment:1-3 inches
- Spring Material:High tensile steel
- Structure:Twin-tube
Bottom line: This kit is ideal for Subaru owners seeking a cost-effective, adjustable coilover that balances performance with everyday usability.
Rev9 R9-HS2-172 Hyper-Street II Coilover Suspension Lowering Kit, Mono-Tube Shock w/ 32 Click Rebound Setting, Full Length Adjustable, compatible with Subaru Impreza STI (GR/GV) 2008-14
This Rev9 Hyper-Street II kit makes a strong case for enthusiasts who prioritize damping precision, thanks to its 32-level rebound adjustment and mono-tube construction that offers better heat dissipation and handling consistency. Compared to the maXpeedingrods twin-tube setup, it provides a more refined ride with finer tuning capabilities, ideal for aggressive street and track driving. However, it does not allow for factory ride height adjustments, which can be a drawback for those wanting a more customizable stance. The steel alloy body and independent spring tension make for a durable, high-performance suspension, though installation requires experience since it lacks detailed instructions. Overall, this kit suits drivers who value adjustable damping for precise handling over height flexibility.
Pros:- 32-way rebound damping adjustment for precise tuning
- Mono-tube construction for better heat management
- Full length adjustable to lower the vehicle properly
- Durable steel alloy body with independent spring tension
Cons:- Lacks factory ride height adjustment, limiting stance customization
- No installation instructions included, requiring professional setup
Best for: Experienced Subaru enthusiasts seeking mono-tube damping with extensive rebound tuning for track-ready handling.
Not ideal for: Casual drivers or those wanting a simple height adjustment, as it doesn’t keep the stock ride height and requires professional installation.
- Fitment:Subaru Impreza STI (GR/GV) 2008-14
- Spring Rate:Front: 8 kg/mm, Rear: 8 kg/mm
- Damping Adjustment:32 Levels
- Construction:Mono-tube
- Full Length Adjustment:Yes
- Top Mount:Pillow Ball Camber Plate
Bottom line: This coilover is perfect for experienced drivers who want fine damping control and high performance on the street or track.
maXpeedingrods Coilovers for Subaru WRX 2015-2021, for WRX STI 2015-2021, Height Adjustable Full Coilover, Suspension Kit, Preset Damping Shock Absorber Struts, Lowering Kit Red
This maXpeedingrods kit is tailored for owners who prioritize a straightforward upgrade with preset damping for predictable handling and height adjustment up to 3 inches. Compared with the Rev9 Hyper-Street II mono-tube setup, it offers a simpler, more user-friendly experience suitable for daily drivers who want a more aggressive stance without complex tuning. The use of durable 6061 aluminum alloy enhances longevity, and the adjustable ride height helps eliminate turning noise for better steering feel. However, it doesn’t provide the extensive damping adjustments of high-end kits, making it less ideal for those seeking precise control. Still, it’s a solid choice for enthusiasts who want a reliable, fully loaded coilover with minimal fuss.
Pros:- Factory preset damping for predictable handling
- Height adjustable up to 3 inches for aggressive stance
- High-quality 6061 aluminum alloy construction
- Easy to install with full load ready for use
Cons:- Limited damping adjustment options compared to mono-tube kits
- Does not keep original ride height, which could affect comfort
Best for: Subaru WRX/STI owners looking for an easy-to-install, height-adjustable suspension with preset damping for regular street use.
Not ideal for: Track-focused drivers or tuners wanting fine damping control and custom ride height without preset settings.
- Fitment:Subaru WRX/STI 2015-2021
- Spring Rate:Front: 10 kg/mm, Rear: 8 kg/mm
- Height Adjustment:1-3 inches
- Damping:Preset
- Material:6061 Aluminum Alloy
- Structure:Full Coilover
Bottom line: This coilover is ideal for daily drivers who want a reliable, adjustable suspension with preset damping and straightforward installation.
R9-HS2-045 compatible with Subaru WRX (VA1) / WRX STI (VA2) 2015-21 Hyper-Street II Coilover Kit w/ 32-Way Damping Force Adjustment Lowering Kit by Rev9, 32 Damping Level Adjustment
This Rev9 Hyper-Street II coilover excels in providing 32-level damping adjustments, making it a top choice for drivers who want to fine-tune their suspension for both street comfort and aggressive handling. The mono-tube shock design ensures durability and heat dissipation, outperforming basic twin-tube setups like the maXpeedingrods kits in damping precision. It does, however, require professional installation due to the lack of instructions and does not include height adjustment to factory ride height, focusing solely on lowering. This makes it ideal for those who want detailed control over damping stiffness but are comfortable with a fixed ride height.
Pros:- 32-way damping force adjustment for detailed tuning
- Mono-tube construction for durability and heat management
- Full length adjustable to lower the vehicle effectively
- High-strength steel alloy body
Cons:- Does not offer height adjustment, only lowering
- Requires professional installation, no instructions included
Best for: Experienced Subaru owners seeking a high-precision, adjustable damping coilover for street or track tuning.
Not ideal for: Beginners or users who need adjustable ride height or a plug-and-play solution, as the setup is more complex and fixed in height.
- Fitment:Subaru WRX/STI 2015-2021
- Spring Rate:Front: 10 kg/mm, Rear: 6 kg/mm
- Damping Adjustment:32 Levels
- Construction:Mono-tube
- Full Length Adjustment:Yes
- Lowering Range:Adjustable for height
Bottom line: This kit suits seasoned enthusiasts demanding precise damping control and a lowered stance for street or track use.
EVIL ENERGY Coilovers Suspension Kit, Compatible for Subaru WRX 2015-2021, Height Adjustable Lowering Kit, Twin-Tube Shocks for Comfortable Ride, Red
This EVIL ENERGY coilover provides a straightforward, budget-friendly option for Subaru WRX owners who want to lower their car while maintaining comfort, thanks to its twin-tube design and 1-3 inch height adjustment. While it doesn’t offer the damping adjustment range of the Rev9 Hyper-Street II or the maXpeedingrods full coilovers, it still delivers a reliable and durable solution suitable for daily street driving. The high-strength steel components and corrosion-resistant coating ensure longevity, but it trades off the fine-tuning and performance precision found in more advanced kits. Installation is recommended by professionals, and it’s best suited for those who prioritize simplicity and comfort over aggressive handling or fine damping control.
Pros:- Affordable price point for entry-level coilovers
- Twin-tube design for stability and comfort
- Height adjustable from 1 to 3 inches
- Corrosion-resistant steel components
Cons:- Limited damping adjustment capabilities
- Less refined handling compared to mono-tube kits
Best for: Budget-conscious Subaru WRX owners wanting an easy-to-install, height-adjustable suspension for daily comfort.
Not ideal for: Performance enthusiasts or track drivers seeking detailed damping tuning or a more aggressive ride stance.
- Fitment:Subaru WRX 2015-2021
- Spring Rate:Front: 8 kg/mm, Rear: 6 kg/mm
- Height Adjustment:1-3 inches
- Shock Type:Twin-tube
- Material:High-strength steel
- Color:Red
Bottom line: This coilover is suitable for daily drivers who want a simple, reliable lowering solution without complex tuning features.
How We Picked
These coilover kits were evaluated based on a combination of performance, build quality, adjustability, ease of installation, and value for money. I prioritized models that offer meaningful damping and height adjustments, as these features directly impact handling and customization. Durability and user reviews also played a significant role in assessing long-term reliability. The ranking reflects a mix of affordability and feature set, aiming to recommend options suitable for a variety of driving styles and budgets.Factors to Consider When Choosing Best Coilover Kits For Subaru STI
Choosing the right coilover kit for your Subaru STI requires understanding several key factors beyond basic specifications. The right setup depends on your intended use—whether it’s daily driving, spirited street use, or track days—and your budget. Paying attention to adjustability, build quality, and compatibility can prevent costly mistakes. This guide highlights the main considerations that will help you select a coilover kit that aligns with your driving needs and expectations.Adjustability and Tuning
Look for coilovers with multiple damping and height adjustment options. Adjustable damping allows you to modify rebound and compression to suit different driving conditions, while height adjustments let you fine-tune your stance and ground clearance. However, more adjustability often means increased complexity and potential for misconfiguration. Beginners should focus on kits with straightforward, easy-to-use controls, while enthusiasts may prefer full-featured setups for precise tuning.
Build Quality and Materials
High-quality materials like aluminum or steel for the shock bodies and corrosion-resistant finishes extend the lifespan of your coilovers. Cheaper models may use inferior components that degrade faster, leading to inconsistent performance over time. Investing in well-constructed kits ensures reliability, especially if you plan to push your vehicle hard or drive in harsher climates. Always check reviews for reports of durability issues before purchasing.
Lowering Range and Ride Comfort
The extent to which a coilover can lower your car varies, impacting ride comfort and clearance. Extreme lowering might enhance aesthetics and handling but can also lead to a harsher ride or clearance problems with speed bumps. Consider your daily driving environment and whether you prioritize a aggressive stance or a more comfortable ride. Some kits offer adjustable ride height to strike a balance between looks and usability.
Ease of Installation and Maintenance
While some coilover kits are designed for easy bolt-on installation, others require professional setup, especially for optimal damping tuning. If you’re a DIY enthusiast, look for kits with clear instructions and common tool compatibility. Regular maintenance, such as cleaning and inspecting for leaks, is essential to maintain performance. Selecting a kit with accessible adjustment points simplifies ongoing tuning and upkeep.
Price and Value
Price ranges significantly, from budget-friendly options to premium setups with advanced features. Cheaper kits might save money upfront but can lack durability and fine-tuning options, leading to higher costs over time. Conversely, investing in a higher-end kit often means better materials, more adjustability, and longer lifespan. Consider your driving style and how much you’re willing to spend to match your expectations with the right value proposition.
Frequently Asked Questions
Do I need professional installation for coilover kits on my Subaru STI?
While some coilover kits are designed for straightforward bolt-on installation, many benefit from professional setup to ensure optimal handling and safety. Proper installation, especially regarding damping adjustments and alignment, can significantly impact performance. If you’re experienced with suspension work, you might install the kit yourself, but otherwise, consulting a specialist is recommended to avoid issues like uneven ride height or compromised safety.
Can I use lower-priced coilovers on my daily-driven Subaru STI?
Budget coilovers can work for daily use but often compromise on ride comfort, durability, and damping precision. Cheaper models may wear out faster or provide less tuning flexibility, leading to inconsistent handling over time. If your daily drive involves rough roads or frequent use, investing in a mid-range or higher-quality kit could provide better reliability and comfort, saving money in the long run.
How important is damping adjustment in coilover kits?
Damping adjustment allows you to customize how the coilovers respond to bumps and cornering forces, directly affecting handling and ride quality. For street driving, a moderate damping range offers comfort and control. For track use or aggressive driving, more precise damping control helps optimize grip and stability. Kits with adjustable damping provide flexibility but may require tuning experience to get the best results.
Will lowering my Subaru STI affect its everyday usability?
Lowering your car can improve its aesthetics and handling by lowering the center of gravity, but it also risks reduced ground clearance and increased road noise or harshness. Extremely lowered setups might lead to scraping or difficulty with speed bumps, especially in daily driving. Balancing lowering with ride comfort and clearance needs careful consideration—some adjustable kits allow you to fine-tune this balance.
What should I consider when choosing between coilover brands?
Brand reputation, build quality, and customer reviews are key factors. Established brands like BC Racing and Rev9 tend to offer better durability and more tuning options. Cheaper, lesser-known brands might save money upfront but can lack long-term reliability. It’s worth choosing a brand with a proven track record, especially if you plan to push your STI hard or require consistent, reliable performance over time.
Conclusion
For most drivers seeking a well-rounded upgrade, the Rev9 Hyper-Street ONE offers excellent value with versatile adjustability and solid performance—making it the best overall pick. Those prioritizing aggressive lowering and track-ready handling should consider the BC Racing BR Series, despite its higher cost. Beginners or daily drivers will benefit from easier, more comfortable setups like the EVIL ENERGY Coilovers. For enthusiasts willing to invest in premium durability and tuning, top-tier brands like BC Racing remain the best choice. Identifying your driving style and priorities will help pinpoint the ideal coilover kit for your Subaru STI.
