Important: The Wagner Tuning BMW B58 300 CPSI HJS Sports Cat Downpipe has been discontinued. Most customers now choose the Wagner BMW B58 200 CPSI Sports Cat Downpipe for outstanding flow, response and fit. For expert advice or to order the recommended alternative, email Sales@nforcd.com.
Wagner Tuning BMW B58 300 CPSI HJS Sports Cat Downpipe
Part number: 500001027.HJS
This high quality BMW B58 sports cat downpipe was the benchmark upgrade for M140i, M240i, 340i, 440i and 540i owners seeking faster turbo spool, reduced back pressure and a sharper, more engaging exhaust note. Built around a genuine 300 CPSI HJS EU6 ECE approved catalyst and manufactured in premium stainless steel 1.4301 SS304, the Wagner Tuning B58 3.5 inch downpipe delivered exceptional flow while retaining OEM-like fit and finish. It is a direct replacement for the factory catalytic converter and includes an adapter to mate perfectly to the stock exhaust system.
Key features and benefits
- 300 CPSI HJS EU6 ECE approved sports catalytic converter for BMW B58 engines
- 3.5 inch diameter system with adapter to the OEM exhaust for easy bolt-on fitment
- High grade stainless steel 1.4301 SS304 construction for durability and reliability
- Direct fit, plug-and-play replacement for the OEM cat with precise fitment
- Lower exhaust back pressure to unlock power and torque potential
- Quicker turbo response and improved throttle feel
- Lower thermal load on the turbocharger for improved longevity
- Designed for non-GPF and non-OPF models only
Real world results enthusiasts loved
We have fitted and used Wagner Tuning B58 downpipes on customer cars and feedback has been consistently excellent. Owners report noticeably quicker spool, stronger mid-range torque and a more purposeful exhaust tone, all while retaining a high quality, ECE approved HJS catalyst and a perfect OEM-style fit.
Compatibility
- BMW M140i and M140i xDrive F20 F21
- BMW M240i and M240i xDrive F22
- BMW 340i and 340i xDrive F30 F31
- BMW 440i and 440i xDrive F32 F33 F36
- BMW 540i 3.0L 250 kW 340 PS G30 G31 2017 to 2018
Only suitable for cars without GPF or OPF.
Fitting service
Professional installation available at Nforcd in Warwickshire. Request a fitting quote at Sales@nforcd.com.
Installation notes
We recommend replacing the downpipe gasket during installation for the best seal and long-term reliability.
Compatibility check before dispatch
We will confirm fitment prior to shipping. Provide your UK registration or the last 7 digits of your VIN at checkout so we can verify compatibility for your BMW B58 model.
Manufacturer and warranty
Manufacturer: Wagner Tuning
Warranty: 2 years manufacturer warranty
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