Cart
Your cart is empty
12 Month Warranty
FITMENT GUARANTEE
worldwide shipping
Choose options
12 Month Warranty
FITMENT GUARANTEE
worldwide shipping
12 Month Warranty
FITMENT GUARANTEE
worldwide shipping
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.
✅ 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.
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
✔️ 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.
Valve Control: Remote valve controller included. Compatible with aftermarket controller upgrades.
Sound Level: Track-ready volume when open. Highway-appropriate when closed.
1 x WSTN Performance Valved Catback Exhaust System
1 x Remote Valve Control Kit
Difficulty: 3/5 Requires workshop lift and exhaust experience
Time Estimate: 2–3 Hours
Mounting Type: Direct bolt-on to factory exhaust flanges
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.
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.
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.
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.
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
From real
4.9
Avg rating
“Put this on my M2 and honestly couldn’t be happier. Fitment was good, welds looked tidy and it sounds unreal compared to stock. Valves work well too, so it’s not obnoxious all the time. Open it up and the car sounds heaps better, much deeper and more aggressive. Makes the whole car feel way more alive. Definitely one of the better mods I’ve done.”
“This is the second exhaust I’ve bought from them now and both times it’s been spot on. Quality is really good, service was easy to deal with and the valved system works exactly how it should. No issues at all. For the money, it’s hard to fault. It gives you the same look and sound as the bigger brands without the massive price tag. Very happy with it.”
“Overall I’m really happy with the exhaust. There was a small fitment issue with one of the brackets, but thats probably my car, nothing major and it still went on fine. Weld quality was very good and once fitted it made a noticeable difference straight away. It’s definitely louder than stock and has a much nicer tone without sounding cheap. There is a bit of drone down low in the rev range, but that’s pretty normal on these when you go for a more aggressive exhaust setup.”
“Installed this on my 2019 M550i and couldn’t be happier with it. With the valves open it sounds deep and properly aggressive, exactly how it should. Close them and it settles right down, which is perfect for daily driving or longer trips. Fitment was spot on too, everything lined up properly and went in without needing to mess around with anything. Really happy with how it turned out.”
“Very nice 3-inch unit. Welds look top notch and the heat shielding is a nice touch as well. Packaging was extremely secure, so everything arrived in perfect condition. Haven’t installed it yet, but first impressions are very good and the quality looks spot on. Can’t wait to get it on the car.”
View product
“Put these on my RS5 and they’ve been great. Quality looked good straight out of the box, nice clean welds and everything felt well made. Once installed, the car had a much better note and felt more alive without being over the top. You can tell they’ve been made properly. Happy with how it all turned out.”
“Quality is unreal. From the start of the order right through to the end, everything was handled properly and communication was fast the whole way through. Service was honestly 10/10. The product itself is on par with other expensive brands and the packaging was just as impressive. Everything was packed carefully and protected really well. Couldn’t fault the experience and I’d definitely recommend them to anyone thinking about buying.”
“Put this on my X5M and the difference was immediate. Sounds tough with the valves open, but still settles down when you want to keep it quiet. That was the main thing I was after and it does both really well. The titanium also looks awesome in person. Overall just really happy with it and glad I went with this setup. Ill be getting one for my M2 soon!”
How every order gets built
Every exhaust and downpipe is built to your vehicle and engine code.
Flanges are CNC machined to match your OEM mounting points. Pipe diameter, bend angles, and hanger positions are set from your chassis spec before anything is cut. No guesswork, no transfers from a similar build.
01
Order placed
Your build is locked in and production begins against your specific vehicles engine code and chassis.
02
Mandrel bent, TIG welded
T304 stainless or Titanium alloy formed to spec. Every join TIG welded by hand for clean, consistent strength.
03
Quality checked
Every unit is personally inspected against fitment specs before it it is shipped.
04
Shipped and tracked
Dispatched via DHL, FedEx, UPS with full tracking. You'll know exactly where your order is.
What stays consistent
T304
Stainless steel
Heat-resistant, corrosion-proof, and built for longevity.
TITANIUM
ALLOY
Half the weight of steel. For when performance and weight saving is key.
TIG
Weld process
Every joint fused by hand. Clean, precise beads that hold under sustained heat and pressure.
CNC
FLANGES
Machined to tolerance. Direct bolt on and perfect seals.
Built to order
Every exhaust is built to your engine code - not pulled from a shelf. When you order, production starts by hand. Lead times are listed on every product page.
Support
Every system we build is vehicle-specific. If you're unsure, reach out before ordering with your make, model, year, and any relevant modifications or click the "Fitment Check" box on this page - we'll confirm fitment before you spend a dollar.
It depends on what's been changed. upgraded turbo, upgraded mid pipe or prior exhaust modifications can all affect fitment. Our exhaust systems/downpipes are designed to fit vehicles stock, from factory. Contact us with your build details and we'll advise honestly.
We work with premium-grade T304 stainless steel and titanium alloy depending on the application. Material specs are listed on each product page
We're built to the same standard, the same materials, the same fabrication quality, the same attention to fitment and finish. The difference is we're not charging you for a badge. You're paying for the product.
Sound level varies by product, vehicle, and configuration. Where available, we've included sound references on the product page. If you want to know what a specific system sounds like on your car, reach out - we'll point you in the right direction.
A properly designed exhaust system reduces back pressure and improves flow - which typically translates to real performance gains. Our downpipes in particular are designed to let turbocharged engines breathe properly. Specific gains depend on your vehicle and tune.
Road legality varies by state, country, and vehicle. It's your responsibility to confirm compliance with your local regulations before fitting. We can advise on the product side, but we can't make that determination for you.
Items listed and in stock ship in 2-3 days. Hand built to order lead times vary by product and are listed on each product page. We'll send you an update at each stage so you're never left wondering where things are.
Yes - we ship worldwide via DHL, FedEx, UPS, and Australia Post depending on your location. Shipping options and estimated costs are shown at checkout.
Reach out before ordering and we'll tell you exactly where things stand and if we can put priority on your build. We'll always be upfront about timeframes.
We strongly recommend having your system fitted by a qualified workshop, particularly for vehicles where warranty or road compliance is a consideration. A professional install also protects the quality of the finished product and ensures proper fitment.
Yes - all necessary hardware is included unless stated otherwise. Some exhausts and downpipes use your cars existing hardware. If anything is missing from your order, contact us immediately and we'll sort it out.
In many cases, yes. Contact us with what you're after and we'll let you know what's possible and what it'll cost.
Contact us directly. We stand behind what we build. If something isn't right, we'll make it right - no runaround.
Yes. Warranty details are outlined in our warranty policy. If you have a specific question about coverage on a particular product, get in touch before you order.
Because every product is built to order, we can't accept returns for change of mind. That's why we strongly encourage you to confirm fitment with us before purchasing - we'd rather sort that out upfront than after the fact.
