Valvetronic Designs 2017-2025 Audi B9 S4 / S5 Valved Sport Exhaust System
or as low as $208.25/mo with Affirm
Available
Sound & Video
Sound & Control
Valves Open
Valves open, the B9's 3.0-liter turbo V6 reveals a surprisingly aggressive character — a deep, throaty snarl under boost that hardens with RPM, punctuated by audible turbo flutter between gear changes and a satisfying crackle on overrun that the factory exhaust completely masks. The sound is rich and textured without being obnoxious — perfectly calibrated to the S4/S5's role as an athletic daily driver that can bare its teeth when provoked.
Valves Closed
With the valves closed, the B9 S4/S5 returns to its factory-quiet demeanor — the exhaust note drops to near-stock levels that preserve the car's understated, professional character. Highway cruising is completely drone-free, cold starts are silent and unobtrusive, and parking garage crawls maintain the discretion that makes the S4/S5 the ideal performance car for people who prefer their speed to be a private matter.
Construction & Engineering
- Material Options: T304 Stainless Steel or Lightweight Titanium
- Valve Actuation: Electronically controlled butterfly valves with wireless remote
- Mandrel-Bent Tubing: Sized for turbocharged V6 exhaust flow optimization
- Precision TIG Welding: Back-purged, continuous bead construction
- B9 Platform Specific: Engineered for updated B9 chassis exhaust routing
Specifications
Fitment
| Year | Make | Model | Variant |
|---|---|---|---|
| 2017+ | Audi | S4 | B9 Sedan |
| 2017+ | Audi | S5 | B9 Coupe / Cabriolet / Sportback |
Installation
What’s Included
- Valvetronic Designs complete valved exhaust system
- Electronically actuated butterfly valve assemblies
- Wireless remote control unit
- Complete gasket and hardware kit
- Valve controller and wiring harness
- Installation guide
VALVETRONIC DESIGNS
Valvetronic Designs Audi B9 S4 / S5 Valved Exhaust System
Unlock the Turbocharged V6's Hidden Aggression
The B9-generation Audi S4 and S5 transitioned from supercharging to turbocharging with a 3.0-liter single-turbo V6 that delivered improved torque, better fuel efficiency, and a broader powerband than its predecessor — a more refined, more capable everyday performance car. But that refinement came at a cost. The B9's factory exhaust system, combined with the turbocharger's natural sound-dampening effect, left the S4/S5 sounding almost indistinguishable from a standard A4 at anything below full throttle. For a car wearing the S badge and carrying Audi Sport's engineering pedigree, the acoustic deficit undermined the emotional connection between driver and machine.
The Valvetronic Designs valved exhaust system for the B9 S4 and S5 restores what the factory calibration removed. Available in T304 stainless steel or titanium, electronically actuated butterfly valves transform the turbocharged V6's character from forgettable to forceful. A rich, throaty exhaust note replaces the factory silence, complete with turbo whoosh, boost-laden snarl, and overrun crackle that give the B9 platform the emotional depth its performance numbers always justified. The Audi S4 B9 Valvetronic exhaust is the single most impactful modification available for this platform.
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