Stainless Valved Catback Exhaust System for Audi B9 S4 S5
The Audi B9 S4 and S5, powered by the EA839 3.0L V6, offer strong performance from the factory—but the stock exhaust limits the engine’s true sound and character. The STRATEC Valved Exhaust System unlocks a more aggressive, performance-driven exhaust tone while retaining refined, OEM-like manners when desired.
Engineered as a complete, one-piece exhaust system, this setup runs from the downpipe connection to the exhaust tips, eliminating the need to mix components from multiple suppliers. The result is consistent sound quality, proper fitment, and seamless performance.
With valves open, expect a bold, motorsport-inspired exhaust note with pronounced overrun crackles. With valves closed, the system returns to a quiet, refined tone suitable for daily driving—without unwanted drone when paired with the factory downpipe.
Why It Works
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Complete One-Piece System: No mixing of axle-backs or resonators
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Electronic Valve Control: Instantly switch between aggressive and refined sound
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Mandrel-Bent Design: Optimized exhaust flow for improved throttle response and power
Sound & Control
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Valves Open: Aggressive tone with strong midrange and sharp overrun crackles
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Valves Closed: Quiet, refined, and OEM-like for daily driving
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No Drone: When used with the factory downpipe
Construction & Details
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Material: Full T304 stainless steel construction
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Weight Savings: Approx. 16.4 lbs lighter than factory exhaust
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Craftsmanship: Precision TIG welding and smooth mandrel bends
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Exhaust Tips: Includes premium tips for a clean, performance-oriented finish
Vehicle Fitment
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2017–2024 Audi S4 (B9)
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2018–2024 Audi S5 (B9)
Pairs well with
Ships within 1-2 business days.
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Stainless Valved Catback Exhaust System for Audi B9 S4 S5
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FAQs
Please read our FAQs page to find out more.
Are OEM products more expensive than aftermarket alternatives?
OEM products might have a higher upfront cost compared to aftermarket parts, but their superior quality and durability often make them a more cost-effective choice over time. Investing in OEM ensures you’re getting parts specifically designed for your vehicle, which can lead to better performance and longevity.
Can I purchase OEM parts online or do I need to visit a dealership?
You don’t need to visit a dealership to get OEM parts. You can conveniently purchase genuine OEM components from authorized distributors and reputable online retailers like Turbo Tech Performance. Our online store provides a wide selection of high-quality parts delivered straight to your door.
Are parts from brands like Mopar, ACDelco, and Motorcraft interchangeable between different vehicle brands?
No, parts from Mopar, ACDelco, and Motorcraft are typically designed for specific vehicle brands. It’s crucial to ensure compatibility with your vehicle’s make and model by checking part numbers and consulting with a knowledgeable expert.
Can I install OEM parts myself, or is it better to have a professional handle it?
While some OEM parts can be installed by DIY enthusiasts, the complexity of installation can vary. For the best results and to ensure proper fitment and performance, we recommend having a trained mechanic install the parts, especially if you’re unfamiliar with automotive repairs.
Do OEM parts come with a warranty?
Yes, many OEM auto parts come with a manufacturer’s warranty that covers defects or issues. Be sure to check the warranty details for each part at the time of purchase, and keep your receipt for any potential warranty claims.