Valved Catback Exhaust for Audi S4 (B9) (2018–2019)

This valved catback exhaust system allows you to switch anytime between quiet OEM-style comfort and a louder, more aggressive performance tone. Built from high-grade 304 stainless steel with precision TIG welding, it offers excellent durability, corrosion resistance, and a clean factory-like finish. The system is fully bolt-on — no cutting or welding required — making installation simple for most exhaust shops. Designed for the turbocharged 3.0T V6, it improves exhaust flow and gives the B9 S4 a deeper and sportier sound compared to the stock system, especially when the valve is open.

Fitment: Compatible with Audi S4 (B9 Platform, 2018–2019), sedan and Avant. Fitment can be confirmed using a VIN or rear exhaust photo if needed.

What’s Included:

Mid-pipe + rear valved catback system

Mounting hardware and clamps

Wireless valve controller or OEM-style valve integration (depending on setup)

Sound Characteristics:

Cold Start: deeper and more noticeable tone

Valve Open: loud, sporty, and performance-focused sound

Valve Closed: close to OEM comfort, ideal for daily and late-night driving

Shipping: Ships directly from our partner factory. Estimated delivery: 2–5 weeks.

Warranty: If the product arrives damaged or defective, replacement parts will be provided.