Stainless Valved Catback Exhaust System for Audi B8 B8.5 S4 S5

Transform the sound and driving experience of your Audi S4 or S5 B8/B8.5 with the STRATEC Valved Exhaust System. Designed for the supercharged V6 platform, this system delivers a unique high-pitch tone while retaining deep, aggressive low-end character—creating a sound profile that stands out from traditional setups.

Constructed entirely from T304 stainless steel and featuring a high-pitch X-pipe, the system runs 2.5-inch tubing from front to rear, enhancing exhaust flow and sound across the entire RPM range. Integrated vacuum-actuated valves, controlled via an included key fob remote, allow instant switching between refined cruising and an aggressive, motorsport-inspired exhaust note.

Why It Works

• High-Pitch X-Pipe Design: Produces a sharper, more exotic tone while improving exhaust flow

• Vacuum Valve Control: On-demand sound adjustment using the included remote

• Mandrel-Bent Tubing: Optimized flow for improved throttle response and power delivery

Sound & Control

• Valves Closed: Quiet and refined for daily driving and highway cruising

• Valves Open: Aggressive, high-energy exhaust tone with strong low-end and high-RPM excitement

• Remote Control: Instantly operate valves from inside the vehicle

Construction & Details

• Material: T304 stainless steel for durability and corrosion resistance

• Weight Savings: Approx. 12.3 lbs lighter than factory exhaust

• Craftsmanship: Precision TIG welding and smooth mandrel bends

• Tubing Diameter: 2.5" from front to exhaust tips

Vehicle Fitment

• 2010–2016 Audi S4 (B8 / B8.5)

• 2010–2016 Audi S5 (B8 / B8.5)