Stone Exhaust Eddy Catalytic Downpipe for BMW B48 B48E and MINI B48 — F39 F40 F44 F46 — X2 20i, 220i, M135i xDrive, M235i xDrive, MINI Cooper S
Upgrade the heartbeat of your BMW or MINI B48 with the Stone Exhaust Eddy Catalytic Downpipe. This high flow, Euro 6 compliant, UK MOT friendly catted downpipe is engineered for the B48 and B48E turbo engines across F39, F40, F44 and F46 platforms, including BMW X2 20i, BMW 220i, BMW M135i xDrive, BMW M235i xDrive, plus MINI Cooper S F55 F56 and MINI F60 Countryman Cooper S. Expect sharper throttle response, faster turbo spool and real-world performance gains while keeping refinement and emissions compliance in check.
If you are searching for BMW B48 downpipe, BMW B48E downpipe, BMW M135i downpipe, BMW F40 M135i xDrive downpipe, BMW M235i xDrive downpipe, BMW 220i downpipe, BMW X2 20i downpipe, MINI Cooper S downpipe or high flow catted downpipe for B48, this is the performance upgrade that delivers. It is also often purchased with the Stone Exhaust BMW B48E F40 M135i xDrive Cat-Back Valvetronic Exhaust System for a complete turbo-back transformation.
Why choose the Stone Exhaust Eddy Catalytic Downpipe for your BMW or MINI B48
- Arc fluid twist-flow catalytic technology creates a vortex for superior exhaust gas purification while maintaining optimal backpressure for power.
- Proven to effectively increase horsepower and torque vs. straight or conventional downpipes during Stone Exhaust testing.
- Patented O2 sensor technology provides accurate, fast data for cleaner fuelling and crisp throttle response.
- No more delay in power delivery. Experience improved turbo spool and mid-range punch.
- High efficiency noble metal catalyst in a high flow sports cat configuration for strong performance and emissions control.
- Computer-simulated diameter and routing for balanced flow, low turbulence and reliability.
- Special 3D design for 100% OEM-like fitment. True bolt-on install with no modification required.
- SUS304 premium grade stainless steel for durability and corrosion resistance.
- Dual cross-welding at the turbo flange to handle extreme heat cycles and prevent fatigue.
- UK MOT friendly and Euro 6 compliant design for road use suitability.
Engineering that stands out
Stone Exhaust engineers use reverse engineering with 3D scanning of OEM parts to understand flow limitations, then optimise pipe diameter, route and bend angles specifically for the B48 and B48E platforms. During R&D, exhaustive CFD and thermal pressure simulations are used to refine exhaust gas flow, temperature zones and pressure distribution until the best balance of power, response and reliability is achieved.
7-axis CNC precision
Each pipe is formed on a 7-axis CNC bending machine to retain up to 98 percent roundness at even tight 180 degree bends, minimising outer bore wear and preventing flow disturbance. Combined with 3D scanning and reverse engineering, Stone achieves sub-0.025 mm accuracy for a smooth, consistent high flow path.
Welding built for heat and longevity
The turbo-to-downpipe flange endures extreme temperatures from 800°C to 1100°C. Stone’s crisscross and overlapping welding technique increases weld width and penetration, boosting strength at the most critical stress points. Direct spot welding with mechanical arms ensures precise, repeatable welds for long-term reliability.
Real-world results from Nforcd
We have fitted and run Stone Exhaust B48 downpipes on customer cars and our own builds. Feedback is consistently positive: faster spool-up, sharper response and a richer, more purposeful exhaust note without excessive drone. Customers choose this BMW and MINI catted downpipe for daily usability, track-ready durability and a true OEM-plus fit and finish.
Compatibility
B48 Engine (A228E)
BMW 2 Series
- F45 F46 220i (2014+)
MINI
- F55 F56 MINI Cooper S (2015+)
- F60 Countryman Cooper S (2017+)
B48E Engine (A228EG)
BMW 1 Series
- F40 M135i xDrive (2018+)
BMW 2 Series
- F44 M235i xDrive (2018+)
- F45 F46 220i (2014+)
BMW X Series
- F39 X2 20i/28i (2016+)
MINI
- F55 F56 MINI Cooper S (2015+)
- F60 Countryman Cooper S (2017+)
Fitment guidance
- A228E Non-OPF for non-OPF/GPF cars.
- A228EG OPF for OPF/GPF-equipped cars.
Unsure whether your BMW or MINI B48 has OPF/GPF. Contact Nforcd and we will confirm compatibility for your VIN.
Part numbers
- A228E (Non-OPF)
- A228EG (OPF)
Manufactured by
Stone Exhaust
Warranty
Stone Exhaust 2 Year Warranty
Professional fitting at Nforcd
For expert fitting, book in with Nforcd in Warwickshire. We offer full installation, health checks and aftercare for BMW B48 and MINI performance upgrades. Request a fitting quote at Sales@nforcd.com.
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