Unlock the full potential of your BMW B58C or Toyota GR Supra with the Wagner catless downpipe for OPF models. This high flow 3.5 inch stainless steel B58 downpipe is engineered for maximum performance, faster turbo spool, reduced back pressure and a harder hitting exhaust note. It is a direct bolt-on replacement for OEM BMW Part No. 18329897313 and includes an adapter to mate perfectly to the stock exhaust system. Part Number: 500001037.CATLESS.
We have installed this Wagner B58C catless downpipe on our own builds and for many customers. Feedback has been consistently positive, with sharper throttle response, stronger mid-range torque and a noticeably more aggressive sound. If you are searching for the best B58 downpipe upgrade for OPF cars, this is the proven choice.
Key features
- High quality stainless steel 1.4301 SS304 construction for durability and heat resistance
- Full 3.5 inch diameter design for maximum flow and reduced exhaust back pressure
- Supplied with adapter for seamless fitment to the OEM exhaust
- Direct fit, replaces OEM component with precise fitment on OPF equipped cars
- Lower thermal load on the turbocharger for improved reliability
- More power potential and significantly more torque thanks to freer flowing design
Confirmed compatibility B58C OPF models
- BMW G20 G21 M340i xDrive 3.0 B58C 285 kW 374 PS 2020 onwards OPF
- BMW G30 G31 540i xDrive 3.0 B58C 250 kW 340 PS 2018 onwards OPF
- BMW G32 640i xDrive 3.0 B58C 250 kW 340 PS 2018 onwards OPF
- BMW G14 G15 G16 840i xDrive 3.0 B58C 250 kW 340 PS 2018 onwards OPF
- BMW G29 Z4 M40i 3.0 B58C 250 kW 340 PS 2018 onwards OPF
- Toyota Supra MK5 A90 GR 3.0 B58 250 kW 340 PS 2018 onwards OPF
Please note: Only suitable for vehicles equipped with OPF. Removal of the catalyst will trigger an error display in the DME.
Why choose this B58 OPF catless downpipe
For owners chasing the best BMW B58 downpipe upgrade for OPF cars, the Wagner OPF catless downpipe delivers track-ready flow and build quality. The 3.5 inch mandrel bent SS304 construction and direct fit design maximise gas velocity, reduce turbo back pressure and help the B58C engine breathe. Expect quicker turbo spool, improved throttle response and a stronger, more engaging exhaust tone. Ideal for tuned M340i, 540i, Z4 M40i and GR Supra builds.
Fitting and installation
Professional installation is recommended. Nforcd offer fitting at our Warwickshire workshop. For a tailored quote and booking, email Sales@nforcd.com.
Compatibility check before dispatch
We will verify fitment before shipping. Provide your UK registration number or the last 7 digits of your VIN at checkout so we can confirm compatibility with your exact vehicle.
Performance graph
Part number
500001037.CATLESS replaces OEM BMW Part No. 18329897313
Manufactured by
Wagner
Warranty
2 years manufacturer warranty
Search terms and fitment keywords
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