Stone Exhaust Eddy Catalytic Performance Downpipe for BMW B58
Unlock power, torque and response from your BMW B58 with the Stone Exhaust Eddy Catalytic Performance Downpipe. Designed specifically for the B58 turbo engine, this high flow catted downpipe delivers faster spool, sharper throttle response and a richer exhaust note while remaining UK MOT friendly and Euro 6 compliant. We have fitted and run this system on our own and many customer cars, and the feedback has been consistently excellent for build quality, fitment and real-world performance.
This B58 catted downpipe uses Stone’s patented Eddy Catalytic Technology to create a vortex effect that purifies exhaust gases while maintaining optimal back pressure. At lower rpm it behaves like a 400 cell sports cat for clean emissions with no check engine lights, then opens up at higher rpm to flow like a 100 cell cat for maximum performance. It is the ideal upgrade for BMW M140i, M240i, 340i, 440i, 540i, 740i, X3 M40i, X4 M40i and Z4 M40i owners seeking a premium, emissions-friendly performance downpipe.
Why choose this BMW B58 catted downpipe
- Proven power and torque gains with faster turbo spool and improved throttle response
- Patented Eddy Catalytic Technology for high flow performance and clean emissions
- No check engine light and error free operation on compatible vehicles
- UK MOT friendly and Euro 6 compliant design
- 100 percent OEM fitment with no cutting or modification required
- Crafted from SUS304 premium grade stainless steel for durability and corrosion resistance
Engineering and build quality
- Patented O2 sensor technology for accurate real-time data and smooth power delivery
- Reverse engineered via 3D scanning of OEM parts for perfect routing and clearances
- 7 axis CNC bending achieves up to 98 percent roundness to minimise flow restriction
- Crisscross and overlapping welds at the turbo flange to withstand extreme temperatures
- Direct spot welding by mechanical arms for precise, strong weld penetration
- Computer-optimised pipe diameter and special 3D design for exact fitment
Compatibility – BMW B58 engine
BMW 1 Series
- F20 LCI / F21 LCI M140i / M140i xDrive (2015+)
BMW 2 Series
- F22 M240i / M240i xDrive (2015+)
- F22 LCI M240i / M240i xDrive (2016+)
- F23 M240i / M240i xDrive (2015+)
- F23 LCI M240i / M240i xDrive (2016+)
BMW 3 Series
- F30 LCI / F31 LCI 340i / 340i xDrive (2014+)
BMW 4 Series
- F32 440i / 440i xDrive (2015+), F32 LCI (2016+)
- F33 440i / 440i xDrive (2015+), F33 LCI (2016+)
- F36 440i / 440i xDrive (2015+), F36 LCI (2016+)
BMW 5 Series
- G30 540i / 540i xDrive (2015+)
- G31 540i xDrive (2016+)
BMW 7 Series
- G11 740i (2014+)
- G12 740i / 740i xDrive (2014+/2015+)
- G12 740Li / 740Li xDrive (2014+/2015+)
BMW X Series
- G01 X3 M40i (2016–2018)
- G02 X4 M40i xDrive (2017+)
BMW Z Series
- G29 Z4 M40i (2019+)
Part number
A214E
Manufacturer and warranty
Manufactured by Stone Exhaust
Stone Exhaust 2 Year Warranty
Fitting and support
This is a direct bolt-on replacement for the OEM B58 downpipe. Professional installation is recommended. For supply and fitting, choose Nforcd in Warwickshire. Request a fitting quote at Sales@nforcd.com.
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