BMW 335i Valved Catback Exhaust 2007-2013 | WSTN Performance (N54/N55 E90/E92/E93)

The N55 deserves to be heard. This is the exhaust that does it. The BMW 335i with the N55 is one of the most tuneable straight-sixes BMW ever built smooth, responsive, and capable of serious power with the right supporting mods. The factory exhaust chokes that potential with restrictive baffling and a sound profile that does nothing for the car's character. The WSTN Performance Valved Catback for the E90/E92/E93 335i changes that. Built from 304 stainless steel with precision mandrel-bent tubing and a valved muffler system, it delivers a deep, refined exhaust note under load while staying controlled on cruise. Every unit is quality checked in Perth before worldwide dispatch built to order, not off a shelf. Why Upgrade? ✅ Acoustic Transformation: The factory N55 exhaust kills what should be a genuinely great exhaust note. The WSTN valved system unlocks a deep, turbocharged growl that suits the car. ✅ Valved Control: Open for full volume under hard driving, closed for highway civility via the included remote valve controller. ✅ Reduced Restriction: Straight-through mandrel-bent construction removes backpressure for improved turbo spool and throttle response. ✅ Direct Bolt-On: No cutting, no welding, no fabrication. Mounts directly to factory flanges on E90/E92/E93 chassis. ✅ 304 Stainless Construction: Corrosion-resistant, built for Australian conditions and worldwide climates. Key Features & Specs Material: 304 Stainless Steel corrosion resistant, built to last Construction: Precision mandrel-bent, TIG-welded joints Muffler Type: Valved remote control included Fitment Style: Direct bolt-on to factory flanges Finish: Brushed 304 stainless with polished tips Fitment & Compatibility ✔️ BMW 335i Sedan (E90) 2007–2013 (N55 3.0T) ✔️ BMW 335i Coupe (E92) 2007–2013 (N55 3.0T) ✔️ BMW 335i Convertible (E93) 2007–2013 (N55 3.0T) Designed for N55-equipped E-series 335i. Verify engine code before ordering early 335i used the N54 (twin-turbo) which shares the same chassis. Contact us if unsure. Technical Note Valve Control: Remote valve controller included. Compatible with aftermarket controller upgrades. Sound Level: Track-ready volume when open. Highway-appropriate when closed. What's In the Box 1 x WSTN Performance Valved Catback Exhaust System 1 x Remote Valve Control Kit Installation Difficulty: 3/5 Requires workshop lift and exhaust experience Time Estimate: 2–3 Hours Mounting Type: Direct bolt-on to factory exhaust flanges Warranty / Shipping DISCLAIMER WSTN Performance components are designed for track and competition use. To protect your build and ensure a perfect finish, we recommend professional installation by a certified specialist/workshop. It is the buyer's responsibility to ensure modifications comply with local regulations. WARRANTY We stand behind every product we sell. All WSTN Performance products carry a 1 year WSTN Performance warranty as standard. This covers any manufacturing defects, giving you total peace of mind that your upgrade is built to last. View our full Warranty policy page here. SHIPPING We offer tracked worldwide shipping on our entire catalogue. Products marked as “Built to Order” are handmade in 3–5 weeks (check the product page as lead times may vary), personally dispatched from our Perth WA facility. View our full Shipping policy page here. RETURNS We offer returns on all products if items are damaged or there is something wrong. If we ever make a mistake, we'll cover the return shipping to make it right. View our full Return policy page here. SUPPORT Need a hand with fitment, shipping, or a return? Our Perth-based team is here to help you get your build perfect. Email: contact@wstnperformance.com Sound Clip