Audi S4 (2018-) B9 Valvetronic Exhaust System

Fi EXHAUST Valvetronic System for Audi B9 S4 / S5 – Aggressive Sound. Intelligent Control.

Transform your Audi B9 S4 or S5 with the Fi EXHAUST Valvetronic System—a high-performance bolt-on exhaust system meticulously engineered from T304 stainless steel. Designed for enthusiasts who want more power and an exhilarating exhaust tone, this system delivers a perfect fusion of performance, luxury, and control.

Smarter Performance, Signature Sound

• Valvetronic Sound Control: Switch between street comfort and track aggression with the factory exhaust/sport button, drive mode, or optional Fi EXHAUST Pro remote and mobile app.

• Power Gains: Expect a 5–10% increase in horsepower after installing the full catless system, which includes the valvetronic catback and ultra high-flow downpipe.

• Two Driving Personalities:

  • Valves Closed: Enjoy a subdued, refined tone for a smooth daily drive.

  • Valves Open: Experience a deep, aggressive sound that enhances the Audi V6 turbo engine’s presence.

Engineered for the Audi B9 Platform

Fi EXHAUST systems are crafted with customized muffler internals, tailored specifically for the B9 S4 and S5 to deliver optimized exhaust flow, balanced backpressure, and a unique tone—while retaining full comfort and control.

Catback System Includes:

• Front Pipe

• Mid X-Pipe

• Valvetronic Muffler

• Quad Silver Tips

• Standard Remote Control System
  Part No: AD-S4B9-CBV + TIP6389S*4 + R2016OL + OBD-CAB-V

Optional Upgrades:

Downpipes:

• Ultra High Flow Downpipe – AD-S4B9-NCAT

• Sport 200 Cell Downpipe – AD-S4B9-CAT200

Exhaust Tip Options:

• Titanium Blue – TIP6389TB*4

• Diamond Black – TIP6389B*4

• Gold Finish – TIP6389G*4

• Carbon Fiber Finish – TIP6389C*4

Pro Remote Control System:

• OBD2 + Mobile App Control Module
  Part No: R2020OBD

Important Notes:

• All components are sold separately for full customization.

• Compatibility may vary by model year and regional spec—check before purchase.

• Product images are for illustration purposes and may not reflect final design.

• Exhaust design may evolve over time.

Why Choose Fi EXHAUST for Your Audi S4 or S5?

Fi EXHAUST brings a bespoke blend of precision tuning, valvetronic control, and racing-inspired acoustics to your Audi. Whether you’re looking for a subtle growl or a full-throttle roar, this system adapts on demand—putting you in control of your vehicle’s voice and performance.

Drive Audi. Sound Fierce. Choose Fi EXHAUST