Unlock the hidden sound potential of your Audi S4 or S5 B9 with the Valvetronic Designs Valved Sport Exhaust System — a complete, premium cat-back upgrade engineered to elevate sound, performance, and driving excitement. The EA839 3.0L turbocharged V6 is an impressive engine, but the restrictive factory exhaust suppresses its true character. This system transforms your B9 into a far more engaging, emotional, and sonically thrilling machine.

Constructed entirely from high-grade T304 stainless steel, the system connects directly to either the OEM downpipe or any aftermarket variant. From there, it flows seamlessly through a completely redesigned midsection and muffler setup before exiting through a beautifully crafted set of exhaust tips. By eliminating factory bottlenecks, exhaust gases move more freely, improving responsiveness while delivering a sharper, more defined tone.

The heart of the system is its electronically actuated valving, operated via a standalone key fob remote. With valves open, your S4/S5 unleashes a raw, motorsport-inspired soundtrack with aggressive overrun burbles during deceleration. With valves closed, the volume drops to a subtle, near-stock tone that’s ideal for early mornings, long highway drives, or quiet neighborhoods. When used with the OEM downpipe, the system maintains a zero-drone driving experience for unmatched refinement.

Engineered as a single, unified exhaust solution — not a collection of outsourced components — the Valvetronic exhaust ensures perfect integration, consistent tone, and long-term durability. Fully mandrel-bent piping, precision TIG welding, and optimized internal routing reduce overall system weight by 16.4 lbs compared to stock. The result is a balanced blend of exotic tone, responsiveness, and everyday comfort.

For owners transitioning from earlier generations like the B6/B7 4.2L V8, the stock B9 can feel overly muted. This system restores the drama, emotion, and excitement Audi’s S cars are known for, giving your turbo V6 the voice it deserves.

Key Features:

• Full cat-back system connecting directly to OEM or aftermarket downpipes
• Premium T304 stainless steel construction for corrosion resistance and longevity
• Electronic valves with included key fob remote for complete sound control
• Dual sound modes: aggressive with valves open; refined and quiet with valves closed
• 16.4 lbs lighter than the factory exhaust system
• Fully mandrel-bent tubing for smoother exhaust flow and enhanced performance
• Precision TIG welding for maximum durability and clean craftsmanship
• No drone or cabin resonance when paired with OEM downpipe
• 100% reversible bolt-on system — can return to stock at any time

Fitment:

• Audi S4 B9 (2017–2024)
• Audi S5 B9 Coupe (2018–2024)
• Audi S5 B9 Sportback (2018–2024)