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BMW M135i/M235i Valved Catback Exhaust 2012-2016 (N55 F20/F21/F22/F23) | WSTN Performance
NO IMPORT FEES
The price you see includes all taxes and import duties. You won't pay anything more when it arrives.
More flow, more sound and more power from the N55 straight six.
WSTN Performance valved catback exhaust for the rear-wheel-drive BMW M135i and M235i (F20, F21, F22 and F23, N55 3.0 turbo straight six). It replaces the factory exhaust from behind the downpipe back to the tips with free-flowing stainless steel pipework, a rear muffler with two electronic valves and a tip each side. The result is more flow, a louder and deeper six-cylinder note, and more power through the rev range. Select your car below, enter your VIN, and we double check fitment before your order ships.
Why Upgrade?
✓ More Flow: Free-flowing stainless steel pipework replaces the restrictive factory catback, so the exhaust gas has a clearer path from the downpipe, through the mid pipe and out through the two tips.
✓ More Sound: A louder, deeper N55 straight-six note when you are on the throttle and more character when you lift off. The sound the factory system holds back.
✓ More Power: Less restriction behind the turbo lets the N55 breathe easier, for sharper throttle response and more power through the rev range.
✓ Perfect Fit: Use the car selector on this page to confirm your model and year, and enter your VIN so we can double check fitment. If entered, your VIN is submitted with your order at checkout.
Key Features & Specs
Material: T304 stainless steel
Valves: Two electronic valves, one on each side of the rear muffler
Valve control: Standalone remote
Tips: Two tips, one each side
Fitment & Compatibility
✓ BMW M135i 5-door Hatch (F20) / 2012-2016 / N55 3.0L
✓ BMW M135i 3-door Hatch (F21) / 2012-2016 / N55 3.0L
✓ BMW M235i Coupe (F22) / 2014-2016 / N55 3.0L
✓ BMW M235i Convertible (F23) / 2015-2016 / N55 3.0L
These are the rear-wheel-drive cars. The all-wheel-drive xDrive versions are not yet confirmed for this system.
Check it fits your car
Use the fitment selector on this page to confirm your exact make, model, and year before ordering.
What's In the Box
✓ 1 x WSTN Performance BMW M135i/M235i N55 valved catback exhaust system (front pipe with flex section, mid pipe, rear muffler with two electronic valves, two tips)
Installation
✓ Replaces the factory exhaust from behind the downpipe back to the tips
✓ Connects to the downpipe through a flanged inlet at the front of the system
✓ Professional installation recommended
Why WSTN Performance?
✓ Fitment checked twice: Use the car selector to confirm your model and year and enter your VIN. We check it again before your order ships.
✓ Quality you know: Built to the same standard as the big brands you already know.
✓ Australian based support: Real people, real enthusiasts.
✓ Worldwide delivery, correct fitment everywhere: Fitments differ between markets and we check for this. Our images may not always show the international version, but what you receive will be the correct fitment for your car.
✓ 1 year warranty: Every product is covered by our 1 year WSTN Performance warranty.
✓ Run by car enthusiasts: We are excited to see our parts on your car.
Warranty / Shipping
DISCLAIMER
WSTN Performance components are designed for track and competition use only. 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. If your product is made to order, the product page shows how long it takes to manufacture, and at checkout you will see how many days delivery takes after manufacturing. If it is in stock, the checkout page will show you when it will arrive. 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
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FAQ
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.
- Fitment guaranteeTell us your engine code and we confirm the fit before it ships.
- 12 month warrantyEvery system is covered for 12 months.
- Shipped worldwideTracked delivery wherever you are.
- Built to your engine codeMade to order for your exact car, not a universal part.