Stone Exhaust Eddy Catalytic Downpipe with GPF for BMW B58D and Toyota Supra A90
Unlock power, torque and response on your BMW B58D or Toyota Supra A90 with the Stone Exhaust Eddy Catalytic Downpipe with GPF. Engineered for GPF and OPF equipped B58D cars, this high flow catted downpipe is designed to deliver performance gains while remaining UK MOT friendly and Euro 6 compliant. Perfect for daily driving and spirited use, with no check engine lights and a direct bolt-on fit to factory hardware.
Part Number: A223E
Why choose the Stone Eddy Catalytic Downpipe for your B58D
- Patented Eddy Catalytic Technology creates a controlled vortex that purifies exhaust gases while maintaining ideal back pressure for power.
- Behaves like a 100 cell sports cat at higher rpm for flow and performance, then like a 400 cell cat at lower rpm for clean emissions and drivability.
- No CEL and error free thanks to the O2 sensor design that provides accurate real time data.
- Direct fit for GPF and OPF equipped models, no cutting and no additional modification required.
- Constructed from SUS304 stainless steel for strength, longevity and corrosion resistance.
- Dual cross welding with precise overlapping techniques for superior durability at high temperature turbo flanges.
- 3D scanned and CAD optimised to mirror OEM routing and clearances for a perfect fit.
- 7 axis CNC mandrel bending achieves up to 98 percent roundness with minimal outer bore wear for smooth flow and reliability.
- UK MOT friendly and Euro 6 compliant design.
Real world results you can feel
Expect faster turbo spool, stronger mid range torque and a deeper, sportier exhaust tone without drone. We have fitted and run this catted downpipe on our own B58 cars and customer feedback has been consistently positive, praising the improved response and clean integration with factory systems.
Compatibility - BMW B58D and Toyota GR Supra
BMW B58D engine
- G20 M340i 2018+
- G20 M340i xDrive 2018+
- G21 340i xDrive 2018+
- G29 Z4 M40i 2019+
Toyota
- GR Supra A90 2020 to present
Direct fitment and installation
Designed as a bolt-on replacement that reuses factory mounting points and sensors. For professional installation and coding advice, we recommend booking fitting with Nforcd in Warwickshire. Request a quote at Sales@nforcd.com.
Engineering that sets it apart
Stone Exhaust reverse engineers each application by 3D scanning the OEM downpipe to capture exact geometry, then simulates exhaust gas flow, thermal load and pressure zones to optimise diameter and bend angles. Manufacturing uses a 7 axis CNC bending machine for precision, followed by direct spot welding and crisscross overlapping welds to increase penetration and strength at the most heat stressed joints.
Key search terms and benefits
BMW B58 downpipe, BMW M340i downpipe, G20 M340i xDrive catted downpipe, G21 340i downpipe, G29 Z4 M40i downpipe, Toyota Supra A90 downpipe, GR Supra catted downpipe, B58D downpipe with GPF, OPF downpipe, GPF downpipe, high flow sports cat, catted downpipe B58, stainless steel downpipe, Euro 6 compliant downpipe, no CEL downpipe, bolt on downpipe, performance exhaust upgrade, B58 turbo downpipe, Stone Exhaust downpipe UK, Eddy Catalytic downpipe.
Warranty
Stone Exhaust 2 year warranty.
Manufacturer
Stone Exhaust
Video
BMW G29 B58D Z4 M40i - Stone Eddy Catted Downpipe
Buy with confidence from Nforcd
We stock, install and support Stone Exhaust products in the UK. If you want proven performance, OE level fit and clean emissions integration on your B58D or A90 Supra, this is the catted downpipe to choose. For fitting and availability, email Sales@nforcd.com.
Part Number: A223E