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BMW 320i/330i/420i/430i/220i/230i/Z4/Toyota GR Supra 2.0 Catless Downpipe 2016-2024 (B48 F3X/G2X) | WSTN Performance
OPF Fitment
The B48 breathes properly once the factory catalytic downpipe comes off.
The B48 is BMW's 2.0 litre turbocharged four cylinder, and it runs right through the F and G series range, from the 220i and the 320i to the 430i, the Z4 and the Toyota GR Supra 2.0. From the factory the first section after the turbo carries a catalytic converter, and that section is the tightest point in the whole exhaust path before the gas ever reaches the mid pipe. This WSTN Performance catless downpipe replaces it with a straight through stainless steel assembly, shielded along the main run, with the flange and sensor connections kept where the car expects to find them.
It is a focused change at the turbo outlet, not a replacement rear exhaust. Everything behind the downpipe stays exactly as it is, which is what makes this the first step in a B48 exhaust build and the one that opens the most restricted section of the system.
Why Upgrade?
✓ A catless flow path: The catalytic element is gone, so the pipe runs straight through from the turbo outlet to the mid pipe connection. This is the direct, catalyst free configuration for a track or competition build.
✓ Sharper response: The downpipe sits immediately behind the turbo, so opening up this section is felt in how quickly the B48 picks up and how freely it carries through the mid range.
✓ A harder note: Taking the catalytic section out of the pipe changes the character of the exhaust, giving the four cylinder a fuller tone that the factory downpipe absorbs before it leaves the engine bay.
✓ Shielding over the hot section: Woven metallic shielding wraps the pipework along the hottest part of the run, while the flange faces and the outlet stay exposed for assembly.
✓ Braided flex section: A braided flex joint sits in the run, so the assembly moves with the engine and driveline instead of sitting rigid between two fixed points.
✓ Factory connection points: A flanged turbo side connection, a sensor port and a mounting bracket are part of the assembly, so it goes back where the original section came out.
Key Features & Specs
Material: Stainless steel
Configuration: Catless downpipe assembly
Engine: B48 2.0T four cylinder
Heat Shielding: Woven metallic shielding over the main pipework
Flex Section: Braided flex joint in the pipe run
Connections: Flanged turbo side connection, sensor port and mounting bracket
Fitment & Compatibility
✓ BMW 320i, 330i, 330e (F30) / 2016-2019 / B48 2.0T
✓ BMW 320i, 330i, 330e (F31) / 2016-2019 / B48 2.0T
✓ BMW 320i, 330i, 330e (F34) / 2016-2019 / B48 2.0T
✓ BMW 420i, 430i (F32) / 2016-2019 / B48 2.0T
✓ BMW 420i, 430i (F33) / 2016-2019 / B48 2.0T
✓ BMW 420i, 430i (F36) / 2016-2019 / B48 2.0T
✓ BMW 220i, 230i (F22) / 2016-2021 / B48 2.0T
✓ BMW 220i, 230i (F23) / 2016-2021 / B48 2.0T
✓ BMW 320i, 330i, 330e (G20) / 2019-2024 / B48 2.0T
✓ BMW 320i, 330i, 330e (G21) / 2019-2024 / B48 2.0T
✓ BMW 420i, 430i (G22) / 2020-2024 / B48 2.0T
✓ BMW 420i, 430i (G23) / 2021-2024 / B48 2.0T
✓ BMW 220i (G42) / 2021-2024 / B48 2.0T
✓ BMW 230i (G42) / 2022-2024 / B48 2.0T
✓ BMW Z4 sDrive20i, sDrive30i (G29) / 2019-2024 / B48 2.0T
✓ Toyota GR Supra 2.0 (A90) / 2020-2024 / B48 2.0T
This listing covers the B48 2.0 litre petrol four. Check the engine code on your car before ordering.
Check it fits your car
Use the fitment selector on this page to confirm your exact make, model, and year before ordering.
Select the option that matches your car. Not sure? Email us your VIN, make and model and we'll confirm fitment.
What's In the Box
✓ 1 x WSTN Performance BMW B48 catless downpipe with heat shielding
Installation
Professional fitting by a workshop with exhaust experience is recommended. The car needs to be raised for access to the turbo outlet, and the sensor connection should be transferred and seated before anything is finally tightened. Have the workshop check flange alignment, clearance around the shielded section and the mid pipe connection, then re check every joint once the car has been run up to temperature.
Disclaimer: Intended for track and competition use only. Compliance with local emissions regulations is the buyer's responsibility.
Why WSTN Performance?
We double check every fitment before it ships, send through your model, year and VIN and we will tell you straight whether this part is right for it.
Heat Shielding
✓ Cooler engine bay: The shield blocks radiant heat coming off the pipe, so the bay around the downpipe runs cooler than it would with bare stainless.
✓ Less heat soak: Hoses, wiring, sensors and intake components sitting near the exhaust run take on less heat.
✓ Easier on heat-sensitive parts: Less constant heat exposure on nearby rubber and plastic parts, which helps them hold up over time.
✓ Factory approach: The same principle used on factory exhaust systems, a barrier between hot metal and the rest of the bay.
✓ Heat stays in the pipe: Keeping heat in the exhaust stream instead of radiating it out supports flow through the pipe.
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. Lead times are shown on the product page and every order is personally dispatched once complete. 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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OPF Fitment
OPF Fitment
Support
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.