Stone Exhaust Eddy Catalytic Downpipe for BMW B46D G20 G22 G30 OPF Models
Upgrade your BMW B46D with the Stone Exhaust Eddy Catalytic Downpipe and unlock sharper throttle response, stronger mid-range torque and a smoother top-end pull without compromising emissions. Engineered for the latest OPF/GPF models and Euro 6 compliant, this high flow catted downpipe is UK MOT friendly, delivers true OEM fitment and is designed to avoid check engine lights on compatible cars. Part Number: A224NE.
Perfect for daily driven performance BMWs, this downpipe uses Stone’s patented eddy catalytic technology to create a vortex effect that purifies exhaust gases while maintaining optimal back pressure. Low rpm drivability remains clean and efficient like a 400 cell cat, while at higher rpm it flows like a 100 cell cat for serious performance gains. It is the ideal high flow catted downpipe for BMW 320i, 330i, 530i xDrive and X3 20i OPF models seeking a bolt-on, emissions-conscious upgrade.
Why choose this BMW B46D downpipe
- Patented eddy catalytic technology for high flow performance with clean emissions
- Designed to avoid check engine lights on supported BMW B46D models
- Euro 6 compliant and UK MOT friendly
- Real-time accuracy from patented O2 sensor layout for consistent data and power delivery
- SUS304 premium grade stainless steel construction
- Special 3D design for 100 percent OEM fitment - no modification required
- Dual cross-welding at the turbo flange for superior durability under extreme heat
- Computer-optimised diameter and routing for maximum flow and reliability
Proven engineering for your BMW
Stone Exhaust engineers reverse engineered the OEM BMW B46D exhaust using 3D scanning to analyse pipe diameter, routing and bend angles across the G20 G22 G30 platforms. Using advanced 3D flow, thermal and pressure simulations, they refined the eddy catalytic design until they achieved optimal performance and reliability for OPF-equipped cars.
Precision manufacturing
- 7 axis CNC bending delivers up to 98 percent roundness with minimal outer wall wear at tight 180 degree bends
- Integrally moulded pipework with accuracy error under 0.025 mm helps prevent flow disturbance
- Crisscross and overlapping welding techniques increase weld width and penetration for long-term strength
- Direct spot welding by mechanical arms improves precision and consistency
Compatibility - BMW B46D OPF models
3 Series
- G20 320i(x) / 330i(x) 2017+
- G21 320i(x) / 330i(x) 2018+
4 Series
- G22 420i(x) / 430i(x) 2020+
- G23 420i(x) / 430i(x) 2020+
- G26 420i(x) / 430i(x) 2020+
5 Series
- G30 530ix 2019+ (530i xDrive)
X Series
- G01 X3 20i(x) / 30i(x) 2017+
- G02 X4 20i(x) / 30i(x) 2017+
Fitment and installation
Direct bolt-on replacement with OEM-style fitment. Professional installation recommended. For fitting, book with Nforcd in Warwickshire - request a quote at Sales@nforcd.com.
Part number
A224NE
Manufactured by
Stone Exhaust
Warranty
Stone Exhaust 2 Year Warranty
What our customers say
We have supplied and fitted this Stone Exhaust eddy catalytic downpipe to multiple BMW B46D cars and feedback has been consistently positive. Customers report quicker spool, stronger torque from low rpm and a more responsive top end while keeping emissions-friendly behaviour on OPF-equipped vehicles.
Emissions notice
Various U.S. states and the U.S. federal government regulate aftermarket exhaust parts and systems. If you are outside the UK, please check local laws before installation. Buyers are responsible for ensuring compliance with all applicable regulations in their region.
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