Stone Exhaust OEM Integrated Valved Cat-Back Exhaust System for BMW G01 X3 20i xDrive and G02 X4 20i xDrive - B48 and B46
Upgrade your BMW X3 20i xDrive or BMW X4 20i xDrive with the Stone Exhaust OEM integrated valved cat-back exhaust system. Precision engineered for the BMW B48 and B46 engines, this premium performance exhaust delivers an addictive sound, sharper throttle response and true OEM fitment. If you are searching for BMW X3 20i exhaust, BMW X4 20i exhaust, G01 catback, G02 catback, B48 valved exhaust or B46 valved exhaust in the UK, this Stone Exhaust system is the proven choice.
Developed since 1998, Stone Exhaust uses full 3D scanning and reverse engineering of the OEM system to create a 100 percent direct-fit cat-back with factory-style integration. Dyno developed in-house, this valved exhaust enhances flow and sound while eliminating the drone commonly found on the stock exhaust. We run Stone systems ourselves and our customers consistently praise the build quality, fitment and refined tone.
Why choose this BMW X3 X4 valved cat-back exhaust
- Direct fit for BMW G01 X3 20i xDrive and BMW G02 X4 20i xDrive - B48 and B46 engines
- OEM integrated valve control - the ECU operates the valve automatically for everyday drivability
- Optional Stone Valvetronic System - single valve with remote control via plug and play OBDII controller
- One piece design with exceptional build quality
- Eliminates drone compared to the standard exhaust
- 3D scanning and reverse engineered for precise OEM fitment
- Dyno developed in-house for performance and sound balance
- Mechanical welding with precision and consistent quality
Sound and drivability - OEM integration with performance tone
With OEM integrated valves, the car’s ECU controls opening and closing automatically. Enjoy a quiet, comfortable cruise when the valve is shut and a deeper, sportier sound when it opens. Add the Stone Valvetronic single valve remote system to take manual control from the cabin using the OBDII plug and play controller.
OPF delete solution
Installing on an OPF equipped car? Stone offers an OPF delete that can be included free of charge. This allows you to run the Stone cat-back on OPF vehicles without triggering an error code, so coding out the OPF warning is not required.
Engineering that sets the benchmark
Stone Exhaust applies 3D simulation during R and D to optimise gas flow, thermal behaviour and pressure zones. The system is produced with a 7 axis CNC bending machine for exceptional roundness and accuracy, reducing flow disruption and stress points. Crisscross and overlapping welding techniques are used at critical areas to improve penetration and endurance, while direct spot welding by mechanical arms achieves consistent, strong welds. The result is a beautifully finished exhaust that fits perfectly and performs seamlessly.
Compatibility
BMW X Series:
- G01 X3 20i xDrive (2017+)
- G02 X4 20i xDrive (2017+)
Engine codes: B48 and B46
Part numbers
- AP543A- (B48 Engine)
- AP543NA (B46 Engine)
Fitting and support
Designed for true OEM fitment with a one piece layout for clean installation. We recommend professional fitting. Nforcd offers installation in Warwickshire - request a quote at Sales@nforcd.com.
Warranty
Stone Exhaust 2 year warranty.
Buy with confidence from Nforcd UK
We are enthusiasts and installers who trust Stone Exhaust on our own cars. If you are searching for BMW X3 20i cat-back, BMW X4 20i cat-back, BMW B48 exhaust upgrade, B46 valved exhaust UK or G01 G02 performance exhaust, this system delivers the sound, quality and fitment you want. Order today or contact our team for expert advice and fitting options.