Choosing the best cat-back exhaust system for your Audi S5 involves balancing sound, performance, build quality, and price. The APR CBK0004 stands out as the overall top pick for its durability and improved flow, while the AWE Tuning B8.5 S5 Touring Edition offers a refined sound with a stylish finish. For those prioritizing track performance, the AWE Tuning Track Edition delivers aggressive tone and power gains, but at a higher cost. Buyers often face tradeoffs between loudness, installation complexity, and long-term durability. Keep reading for detailed insights on each option to help you find the best fit for your needs.
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Key Takeaways
- The top exhaust systems balance sound quality with performance gains, rather than focusing solely on loudness.
- Material quality, especially stainless steel, significantly impacts durability and maintenance over time.
- Aesthetics, such as tip design and finish, influence the overall look but may add to the cost.
- Track-focused models tend to prioritize aggressive sound and power, often at the expense of daily comfort.
- Installation ease varies; some systems require professional fitting, while others are more straightforward for DIY enthusiasts.
| APR CBK0004 Catback Exhaust System – Stainless Steel |  | Best Overall for OEM-Style Quality and Sound | Material: T304 stainless steel | Construction: Argon-back-purged TIG welding | Tubing: Single 3″ to quad 2.5″ | VIEW LATEST PRICE | See Our Full Breakdown |
| AWE Tuning Audi B9 SQ5 Non-Resonated Touring Edition Cat-Back Exhaust – No Tips (Turn Downs) |  | Best for Sporty SQ5 Owners Preferring a Rawer Sound | Fitment: Audi B9 SQ5 | Configuration: Non-Resonated Touring Edition | Material: Steel | VIEW LATEST PRICE | See Our Full Breakdown |
| AWE Tuning Audi B8.5 S5 3.0T Touring Edition Exhaust System – Polished Silver Tips (90mm) |  | Best for B8.5 S5 Owners Seeking a Quality Upgrade with Style | Vehicle Fitment: Audi B8.5 S5 3.0T | Tip Finish: Polished Silver | Tip Diameter: 90mm | VIEW LATEST PRICE | See Our Full Breakdown |
| AWE Tuning Track Edition Exhaust System for Audi B8 S5 4.2L with Diamond Black Tips |  | Best for V8 S5 Enthusiasts Wanting an Aggressive Sound | Fitment: 2008 Audi B8 S5 4.2L | Tip Finish: Diamond Black | Edition: Track Edition | VIEW LATEST PRICE | See Our Full Breakdown |
| AWE Tuning Audi B8 S5 4.2L Track Edition Exhaust System – Polished Silver Tips – 3020-42014 | | Best for V8 Enthusiasts Wanting a Classic Look and Sound | VIEW LATEST PRICE | See Our Full Breakdown | |||
| AWE Tuning Audi B8.5 S5 3.0T Touring Edition Exhaust System – Polished Silver Tips (102mm) |  | Best Overall for Balanced Performance and Sound | Tips Diameter: 102mm | Material: Stainless Steel | Finish: Polished Silver | VIEW LATEST PRICE | See Our Full Breakdown |
| AWE Tuning 3010-43030 Audi S5 Touring Edition Cat-Back Exhaust System (Diamond Black Tips, 102mm, 3.0T) |  | Best Value for Stylish Appearance and Moderate Sound | Material: 304 Stainless Steel | Tips Finish: Diamond Black | Tips Diameter: 102mm | VIEW LATEST PRICE | See Our Full Breakdown |
| AWE Tuning Audi B9 S5 Sportback SwitchPath Exhaust – Non-Resonated (Black 102mm Tips) – 3025-43046 |  | Best for Track Enthusiasts and Noise Connoisseurs | Tips Diameter: 102mm | Material: Stainless Steel | Resonated: Extremely Loud | VIEW LATEST PRICE | See Our Full Breakdown |
| cat-back exhaust systems for Audi S5 | Material |
|---|---|
| APR CBK0004 Catback Exhaust Sy | T304 stainless steel |
| AWE Tuning Audi B9 SQ5 Non-Res | Steel |
| AWE Tuning Audi B8.5 S5 3.0T T | Steel |
| AWE Tuning Track Edition Exhau | High-quality construction |
| AWE Tuning Audi B8 S5 4.2L Tra | — |
| AWE Tuning Audi B8.5 S5 3.0T T | Stainless Steel |
| AWE Tuning 3010-43030 Audi S5 | 304 Stainless Steel |
| AWE Tuning Audi B9 S5 Sportbac | Stainless Steel |
More Details on Our Top Picks
APR CBK0004 Catback Exhaust System – Stainless Steel
This APR stainless steel cat-back system makes a compelling choice for those seeking a seamless, factory-like appearance combined with a refined exhaust note. Its T304 construction and argon-back-purged TIG welding ensure durability, while the straight-through mufflers and Helmholtz resonator balance sound absorption with performance, making it versatile for daily driving and spirited runs. Compared with the AWE Touring Edition, APR offers a more OEM-like look and sound, though it may lack the aggressive tone some enthusiasts desire. The removable slash-cut tips add aesthetic flexibility. The direct bolt-on fit simplifies installation, but the high-quality materials come at a premium price, and some may find the sound too subdued if they prefer a louder exhaust. This pick suits owners wanting a factory-quality upgrade without sacrificing reliability or appearance.
Pros:- Stainless steel T304 construction for corrosion resistance
- OEM-style fit with polished slash-cut tips
- Balanced sound absorption with Helmholtz resonator
- Removable tips for aesthetic flexibility
Cons:- Higher price point compared to some aftermarket brands
- Sound may be too subdued for those craving loud exhaust notes
Best for: Owners who prioritize OEM-style fit and sound with long-term durability
Not ideal for: Enthusiasts seeking maximum volume or aggressive tone, as this system leans toward refined refinement
- Material:T304 stainless steel
- Construction:Argon-back-purged TIG welding
- Tubing:Single 3″ to quad 2.5″
- Tips:Removable 4″ slash-cut
- Fitment:OEM direct bolt-on
- Sound Absorption:Straight-through mufflers with Helmholtz resonator
Our verdict“This system is perfect for owners wanting a durable, OEM-style upgrade with a balanced sound profile.”
AWE Tuning Audi B9 SQ5 Non-Resonated Touring Edition Cat-Back Exhaust – No Tips (Turn Downs)
This AWE Tuning system is engineered specifically for the B9 SQ5, offering a non-resonated Touring Edition that emphasizes a more aggressive exhaust tone. Its steel construction with precision-formed tubing ensures a perfect fit, though professional installation is recommended, adding to the overall cost. Unlike the APR or the AWE Touring Edition with tips, this model skips tips entirely, opting for turn-downs, which can give a more utilitarian look but may not appeal to owners seeking a polished aesthetic. It provides a noticeable increase in exhaust volume and tone, making it ideal for drivers who want their SQ5 to sound sportier without excessive drone. However, the lack of resonation can lead to increased noise levels, potentially uncomfortable for daily use, and verify fitment beforehand. It’s well-suited for those who want a vehicle-specific system with a more pronounced exhaust note.
Pros:- Vehicle-specific direct-fit for B9 SQ5
- Precision-formed steel tubing for durability
- No tips, with turn-downs for a utilitarian look
- Enhanced exhaust tone without resonation
Cons:- Professional installation recommended, increasing costs
- No exhaust tips included, limiting aesthetic options
- Potentially very loud and drone-prone for daily driving
Best for: Owners of the B9 SQ5 who want a louder, sportier sound with a utilitarian look
Not ideal for: Owners seeking a polished aesthetic or a quieter, refined exhaust tone
- Fitment:Audi B9 SQ5
- Configuration:Non-Resonated Touring Edition
- Material:Steel
- Tips:No tips, turn-downs only
- Construction:Precision-formed tubing
- Sound:More aggressive tone
Our verdict“This system is ideal for SQ5 owners craving a rawer, sportier exhaust sound with a straightforward look.”
AWE Tuning Audi B8.5 S5 3.0T Touring Edition Exhaust System – Polished Silver Tips (90mm)
The AWE Touring Edition for the B8.5 S5 delivers a polished, high-quality upgrade with its 90mm silver tips and steel construction. Its direct-fit design ensures seamless installation, matching the factory appearance while enhancing the exhaust note. Compared with the APR system, this AWE offering emphasizes style with the polished silver tips, appealing to owners who want a subtle yet noticeable aesthetic upgrade. It produces a refined sound, suitable for daily driving but capable of a sportier tone when needed. The main tradeoff is its weight—at 71.7 pounds, it’s on the heavier side—and the need for professional installation. It’s best suited for owners who prioritize aesthetics and a balanced sound over maximum volume or aggressive tone.
Pros:- Vehicle-specific direct-fit design
- Polished silver tips with 90mm diameter
- Premium steel construction with precision tubing
- Balanced, refined exhaust tone
Cons:- Heavy at 71.7 pounds, may complicate installation
- Requires professional installation
- Less aggressive sound than non-resonated or Track editions
Best for: B8.5 S5 owners who want a stylish, high-quality exhaust with a subtle sporty tone
Not ideal for: Owners seeking maximum volume or an aggressive, race-inspired sound
- Vehicle Fitment:Audi B8.5 S5 3.0T
- Tip Finish:Polished Silver
- Tip Diameter:90mm
- Material:Steel
- Fit Type:Direct-fit
- Warranty:Manufacturer warranty included
Our verdict“This exhaust is best for owners wanting a stylish, well-built upgrade with a refined sound profile.”
AWE Tuning Track Edition Exhaust System for Audi B8 S5 4.2L with Diamond Black Tips
The B8 S5 4.2L Track Edition from AWE Tuning emphasizes performance and sound, featuring Diamond Black tips and a construction built for durability. Its aggressive tone is ideal for drivers who want their V8 to roar, especially since it forgoes a resonator, which can lead to a louder, more unfiltered exhaust note. Compared with the 3.0T models, this system suits V8 owners who prioritize sound over subtlety and want a race-inspired experience. The high-quality build complements its performance focus, but the lack of resonation might produce drone or excessive noise during daily use. It’s recommended for those who don’t mind increased volume and want a system tailored for spirited driving or track days.
Pros:- Durable high-quality construction
- Diamond Black attractive tips
- Designed specifically for 4.2L V8 engine
- Enhanced aggressive exhaust tone
Cons:- Lack of resonator increases noise and drone
- Potentially uncomfortable for daily use
- May be too loud for some residents
Best for: V8 S5 owners seeking maximum exhaust sound and aggressive tone
Not ideal for: Daily drivers or owners seeking a quieter, more refined experience
- Fitment:2008 Audi B8 S5 4.2L
- Tip Finish:Diamond Black
- Edition:Track Edition
- Material:High-quality construction
- Sound:Aggressive, loud
- Resonance:None (non-resonated)
Our verdict“This system is perfect for V8 owners wanting a loud, aggressive exhaust for spirited driving or track use.”
AWE Tuning Audi B8 S5 4.2L Track Edition Exhaust System – Polished Silver Tips – 3020-42014
This B8 S5 4.2L Track Edition from AWE Tuning offers a polished silver tip aesthetic combined with high durability and performance. Its design emphasizes strength and a sporty appearance, appealing to owners who want a premium upgrade with a classic visual. Compared with the Diamond Black Tips version, this polished silver option provides a more traditional look that complements the V8’s character. It delivers a robust, louder sound suitable for enthusiasts who want their V8 to be heard, especially during spirited driving. The system’s high-quality build ensures longevity, but the heavier weight and lack of resonator mean increased noise levels, which might not be ideal for daily commuting. It’s tailored for owners who want a high-performance system that looks as good as it sounds.
Pros:- Polished silver tips for a refined look
- High-quality durable construction
- Designed specifically for 4.2L V8 engine
- Loud, aggressive exhaust tone
Cons:- Lack of resonator increases drone and noise
- Heavier than some alternatives at 62.4 pounds
- May be too loud for regular daily driving
Best for: V8 owners seeking a durable, visually classic exhaust with a loud tone
Not ideal for: Daily drivers or those who prefer a quieter, more subtle exhaust
Our verdict“This exhaust suits V8 owners wanting a classic, durable, and loud system for spirited use and show appeal.”
AWE Tuning Audi B8.5 S5 3.0T Touring Edition Exhaust System – Polished Silver Tips (102mm)
This Touring Edition exhaust system stands out for its combination of refined sound and quality craftsmanship, making it a versatile choice compared to the more aggressive AWE Track Edition. It is expertly crafted in-house, ensuring high build quality and smooth operation at idle and cruise, with a satisfying throttle roar when pushed. Unlike some louder models, it maintains a balanced tone suitable for daily driving. However, a potential drawback is the factory downpipe rattling issue that may require an additional fix, which could be inconvenient for those seeking a straightforward upgrade. Compared to lesser systems, this offers a premium finish and durability, but at a higher price point, which might be a concern for budget-conscious buyers. Overall, this exhaust makes the most sense for those who want a refined yet spirited sound without sacrificing reliability or quality.
Pros:- Expertly crafted in-house for high quality
- Refined sound with a smooth idle and cruise
- Unleashes a powerful throttle roar when hard on the pedal
- Balanced for daily driving and spirited performance
Cons:- Factory downpipe can cause rattling, requiring additional fixing
- Higher price compared to entry-level options
Best for: Audi S5 owners who desire a high-quality, balanced exhaust that enhances both sound and daily comfort.
Not ideal for: Buyers seeking an aggressive, loud exhaust for track use or loud street performance, as this system prioritizes refinement over maximum volume.
- Tips Diameter:102mm
- Material:Stainless Steel
- Finish:Polished Silver
- Sound Level:Balanced with Roar on Throttle
- Compatibility:Audi B8.5 S5 3.0T
- Manufacture:AWE Tuning
Our verdict“Ideal for those who want a premium, well-rounded exhaust that balances sound, quality, and everyday drivability.”
AWE Tuning 3010-43030 Audi S5 Touring Edition Cat-Back Exhaust System (Diamond Black Tips, 102mm, 3.0T)
Compared with the more premium AWE Touring Edition, this Touring Edition cat-back offers a compelling balance of quality and affordability. Constructed from durable 304 stainless steel, it resists corrosion and provides a sleek, aggressive look with its quad diamond black tips, adding a sporty flair to the rear. Its moderate exhaust note makes it suitable for daily drivers who want a noticeable upgrade without overwhelming noise. The complete system improves exhaust flow, enhancing performance subtly. That said, its limitation is the exclusive fitment for the Audi S5 3.0T, which means it won’t work on other models. This makes it a smart choice for owners who want a stylish, reliable upgrade at a more accessible price, but less so for those seeking maximum volume or a custom fit for different Audis.
Pros:- Constructed from corrosion-resistant 304 stainless steel
- Quad diamond black tips add a sleek, aggressive look
- Moderate sound level suitable for daily driving
- Complete cat-back for improved exhaust flow
Cons:- Limited to Audi S5 3.0T, reducing versatility
- Less aggressive sound compared to more performance-oriented systems
Best for: Owners of the Audi S5 3.0T looking for a stylish, corrosion-resistant exhaust with moderate sound at a reasonable price.
Not ideal for: Those wanting a loud, aggressive exhaust or owners with different Audi models, as this is tailored specifically for the S5 3.0T.
- Material:304 Stainless Steel
- Tips Finish:Diamond Black
- Tips Diameter:102mm
- Number of Tips:4
- Sound Level:Moderate
- Vehicle Fitment:Audi S5 3.0T
Our verdict“A stylish, durable upgrade that enhances appearance and sound without excessive volume, perfect for daily drivers with an eye for aesthetics.”
AWE Tuning Audi B9 S5 Sportback SwitchPath Exhaust – Non-Resonated (Black 102mm Tips) – 3025-43046
This SwitchPath Exhaust system is designed for maximum sound and performance, especially favored by owners who want the loud, straight-pipe experience. Without resonators, it delivers a raw, aggressive tone that surpasses the more refined Touring models, making it better suited for track days or spirited street driving. The non-resonated downpipes and straight pipe sections contribute to a significant increase in volume and a more visceral sound, unlike the more subdued AWE Touring Edition. However, this system is not ideal for daily use or noise-sensitive environments, and professional installation is strongly recommended due to its complexity. Its stainless steel construction ensures durability, but the intense sound profile involves a clear tradeoff—less civility for more thrill. This pick makes the most sense for drivers who prioritize maximum performance and sound over comfort and legality.
Pros:- Maximum sound and performance with no resonators
- Stainless steel construction for durability
- Straight pipe sections for increased flow
- Designed for maximum volume and aggressive tone
Cons:- Extremely loud, unsuitable for daily driving
- Requires professional installation
- Lacks noise regulation compliance for street use
Best for: Track-day enthusiasts and aggressive drivers who crave maximum noise and performance from their S5.
Not ideal for: Owners seeking a subtle, daily-friendly exhaust or those in noise-restricted areas, as this system is very loud and raw.
- Tips Diameter:102mm
- Material:Stainless Steel
- Resonated:Extremely Loud
- Application:Audi B9 S5 Sportback
- Design:Straight Pipe Sections
Our verdict“Best suited for owners who want an unfiltered, aggressive exhaust experience and are willing to accept the associated noise and installation complexity.”
How We Picked
These exhaust systems were evaluated based on several criteria: build quality, material durability, sound profile, performance improvements, ease of installation, and value for money. We prioritized products with proven performance enhancements and positive user feedback, especially those designed specifically for the B8 and B9 Audi S5 models. Price was considered alongside features to identify options that offer the best bang for the buck, while premium systems were assessed on craftsmanship and tone. Rankings reflect a combination of these factors, aiming to guide both casual owners and performance enthusiasts toward the best choices for their specific goals.Factors to Consider When Choosing Best Cat-back Exhaust Systems For Audi S5
When selecting a cat-back exhaust for your Audi S5, it’s important to consider how your priorities align with the system’s features. Sound level, material quality, and aesthetic details like tips influence both daily driving enjoyment and long-term durability. Additionally, compatibility and ease of installation can determine whether you’ll need professional help or can handle the upgrade yourself. Being aware of these factors helps prevent common pitfalls such as choosing a system that’s too loud for daily use or one that doesn’t fit properly. Here are key considerations to keep in mind:Sound and Tone
Deciding between a mild, sporty exhaust and a loud, aggressive one depends on your personal preference and usage. Some systems are designed to produce a refined growl suitable for daily driving, while others emphasize a deep, race-inspired roar. It’s worth considering whether you want a system that enhances sound without overwhelming your interior or neighbors. Manufacturers often specify the sound profile, but real-world experiences vary, so reading user reviews can help gauge actual noise levels at different RPMs.
Material Quality and Durability
Stainless steel is the standard for longevity, resisting rust and corrosion, especially in climates with harsh weather. Lower-grade materials may save money initially but tend to degrade faster, leading to costly replacements down the line. Also, look for systems with high-quality welds and finishes, such as polished or black coatings, which resist discoloration and scratches. Investing in durable materials ensures the system maintains its appearance and performance over years of use.
Installation and Fitment
Ease of installation varies widely; some systems are designed for straightforward bolt-on fitment, suitable for DIY installation, while others may require professional welding or custom fitting. Verify compatibility with your specific S5 model and year, as slight differences can cause fitment issues. Proper installation not only affects sound and performance but also prevents leaks and rattles, which can develop if the system isn’t properly secured.
Performance Gains
Many systems promise horsepower and torque improvements, but actual gains depend on the overall exhaust design and whether the system complements your engine setup. Track-oriented models often emphasize maximum flow, resulting in noticeable acceleration boosts and sound enhancements. Consider if your goal is purely aesthetic, daily driving improvement, or track performance, and choose accordingly to avoid overpaying for features you won’t use.
Aesthetic Details
Tips, finishes, and overall design impact the visual appeal of your car. Black tips can give a more aggressive look, while polished silver adds a sleek, refined touch. The size of the tips—ranging from 90mm to 102mm—also influences the visual statement. Remember that more elaborate finishes or special materials might increase the price but can significantly enhance your car’s overall appearance.
Frequently Asked Questions
Will installing a new cat-back exhaust improve my Audi S5’s horsepower?
Yes, upgrading to a quality cat-back exhaust can enhance your S5’s horsepower and torque by reducing backpressure and improving exhaust flow. The actual gains depend on the specific system and whether it’s paired with other performance mods, but most users notice a more responsive throttle and slight power increases. Keep in mind that the difference might be subtle on its own, but combined with other upgrades, it can contribute meaningfully to overall performance.
How loud will my car be with a sport-oriented exhaust system?
The loudness varies widely based on the design and materials used. Track editions and non-resonated systems tend to produce more aggressive, louder sound profiles, especially at higher RPMs. Conversely, touring or non-resonated systems aim for a balanced tone that enhances sound without overwhelming the cabin or neighborhood. Reading reviews and manufacturer specifications can help set expectations, but installing a system with adjustable valves offers flexibility if available.
Can I install a cat-back exhaust myself, or should I seek professional help?
Many bolt-on systems are designed for straightforward installation and can be tackled by experienced DIYers with basic tools. However, some models might require welding or more complex fitting, especially if modifications are needed. If you lack experience or the system isn’t explicitly labeled as DIY-friendly, hiring a professional ensures proper fitment, preventing leaks or rattles that can develop from improper installation. Consider your skill level and the system’s complexity when planning the upgrade.
Will a louder exhaust system affect my daily driving or neighbor peace?
Louder exhaust systems, especially those designed for track use, can be intrusive during daily city driving, potentially violating noise regulations depending on your area. If regular commuting is your priority, a system with a refined tone or adjustable valves might be better suited. It’s also worth considering the sound level at idle and cruising RPMs, not just maximum loudness, to avoid discomfort for yourself and others.
How do I choose between a polished or black finish for the tips?
The choice between polished or black tips largely depends on your aesthetic preferences. Polished silver tips tend to give a classic, sleek look that complements a refined or sporty style. Black tips offer a more aggressive, modern appearance that can blend well with darker or matte finishes on your car. Consider your overall vehicle color scheme and personal taste, and remember that black tips may show fingerprints and scratches more easily than polished ones.
Conclusion
For most Audi S5 owners seeking a balanced upgrade, the APR CBK0004 offers excellent performance and durability at a reasonable price, making it the best overall choice. Enthusiasts focused on maximum sound and power may prefer the AWE Tuning Track Edition, despite its higher cost. Budget-conscious buyers should look at systems with good build quality that don’t overshoot their budget, while those new to modding may want a straightforward, bolt-on option with clear instructions. For a refined look, the polished tips versions deliver style without sacrificing performance. Ultimately, your choice depends on whether you prioritize sound, looks, performance, or value, but this lineup covers all those bases.
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