Audi B9 S4 & S5 Valved Exhaust System

Full T304 Stainless Steel System with Electronic Valve Control

Overview

The Audi B9 S4 and S5, powered by the EA839 3.0L V6, have impressive performance potential-but the stock exhaust hides much of this engine’s true character. The Valvetronic Designs Full Valved Exhaust System unleashes its voice, delivering an aggressive, motorsport-inspired tone when desired, and stock-like refinement when needed.

Unlike typical setups requiring multiple components from different vendors, our system is engineered as a complete solution-from the OEM or aftermarket downpipe all the way to the exhaust tips. This single-package design eliminates the need for mixing and matching resonator sections or axle-backs from other brands, ensuring perfect fitment, seamless performance, and consistent sound quality.

With valves open, expect a bold exhaust note, pronounced overrun crackles, and a commanding presence. With valves closed, the car returns to quiet factory manners, with zero drone when paired with the OEM downpipe.

For those upgrading from the V8-powered B6 or B7 S4, our system delivers the level of engagement and emotional sound you’ve been missing-ensuring your B9 ownership experience is just as exciting.

Why It Works

• One-Piece System Design: Eliminates the need for mixing components from multiple vendors.

• Electronic Valve Control: Switch between aggressive and refined sound instantly.

• Mandrel-Bent Construction: Maximizes flow for improved throttle response and power.

Sound & Control

• Valves Open: Aggressive tone with rich midrange and sharp overrun crackles on deceleration.

• Valves Closed: Quiet, refined, and OEM-like for comfortable daily driving.

• No Drone: When paired with the OEM downpipe, cabin comfort is unaffected.

Construction & Options

• Material: T304 stainless steel for long-term durability and corrosion resistance.

• Weight Savings: 16.4 lb lighter than the OEM exhaust system.

• Craftsmanship: Precision TIG welds and mandrel bends for optimal flow and strength.

• Tips: Includes premium exhaust tips for a finished, performance-oriented look.

Fitment

• 2017–2024 Audi S4 (B9)

• 2017–2024 Audi S5 (B9)
  
  (Doesn't fit Sportback models)

Installation Notes

• Direct-fit for sedan models.

• Coupe models require modification to shorten the mid-section for proper fitment. Contact info@valvetronic.com for guidance.
  

What’s Included

• Full T304 stainless steel valved exhaust system

• Electronic exhaust valves with key fob remote system

• All necessary clamps and hardware

Specifications

• Tubing: Full mandrel-bent T304 stainless steel

• Valves: Electronic, remote-controlled

• Weight Savings: 16.4 lb lighter than OEM

• Finish: Brushed stainless steel