Stone Exhaust BMW B48 B46 G01 G02 OEM Integrated Valved Cat-Back Exhaust System for X3 30i xDrive and X4 30i xDrive
Upgrade your BMW X3 30i xDrive G01 or BMW X4 30i xDrive G02 with the Stone Exhaust OEM Integrated Valved Cat-Back Exhaust System. This valved catback exhaust is engineered for the BMW B48 and B46 2.0 turbo petrol engines and delivers true performance, a deeper exhaust note and precision fitment. Developed using 3D scanning, reverse engineering and in-house dyno testing, the Stone Exhaust system offers OEM-level fit with race-bred sound and response. If you are searching for BMW X3 catback exhaust, BMW X4 cat-back exhaust, BMW B48 valved exhaust, BMW G01 exhaust or BMW G02 exhaust, this is the premium UK choice.
The OEM Integrated Valve version retains factory-style valve control. Your ECU opens and closes the valve automatically, giving civilised, drone-free cruising and an aggressive tone on throttle. Prefer manual control of the exhaust valve? Add the optional Stone Valvetronic System with remote controller to switch volume and tone when you want it.
Why choose this Stone Exhaust cat-back for your BMW X3 30i and X4 30i
- Designed specifically for BMW G01 X3 30i xDrive and G02 X4 30i xDrive with B48 or B46 engines
- OEM Integrated Valve for factory ECU control of the exhaust valve
- Optional Stone Valvetronic remote valve control available
- 100% OEM fitment via 3D scanning and reverse engineering
- In-house dyno developed for proven performance and response
- Engineered to eliminate drone compared to the standard exhaust system
- One-piece design with precision mechanical welding
- 7-axis CNC bending for accuracy, smooth flow and durability
- Plug-and-play OBDII controller compatibility when using the Valvetronic option
Sound and performance you can feel
Expect a refined, deeper tone at idle and cruise with the valves closed, and a louder, crisper, sports exhaust note with the valves open. This cat-back exhaust keeps your X3 30i and X4 30i comfortable on the motorway and properly exciting on B-roads. Developed on Stone’s in-house dyno, it has been proven to produce more power with that signature Stone Exhaust sound.
OPF/GPF compatibility
Running an OPF/GPF equipped car? Stone offers an OPF delete solution that can be included free of charge, allowing installation of the Stone cat-back exhaust on OPF-equipped vehicles without triggering an error code. No ECU coding required to remove OPF faults. For road use, please check local regulations.
Engineering that makes the difference
- 3D Scanning and Reverse Engineering for perfect OEM-style mounting points and fitment
- Flow-optimised routing to reduce restriction and enhance turbo spool and throttle response
- 7-axis CNC bending delivering exceptional roundness and integrity at tight radii
- Crisscross and overlapping welding techniques at high-stress joints for strength and longevity
- Direct spot welding by mechanical welding arms for precision and durability
Compatibility
BMW X Series with B48 or B46 engines:
- G01 X3 30i xDrive 2017+
- G02 X4 30i xDrive 2017+
What our customers say
We have installed Stone Exhaust systems on customer cars and on our own builds. Feedback is consistently positive: superb fitment, quality welding, and a fantastic valved exhaust note with no motorway drone. The combination of OEM integration and a genuine performance edge makes this one of the best BMW B48 valved cat-back exhausts available in the UK.
Video
BMW G02 X4 30i xDrive B48 with catless DP and Stone Valvetronic cat-back exhaust
Fitted photos
Technical development
Stone Exhaust engineers collect data on pipe diameter, route and bend angles, then simulate exhaust gas flow, thermal load and pressure zones to optimise performance before production. The result is a precision cat-back exhaust for the BMW G01 X3 30i and G02 X4 30i that looks, fits and performs at the highest level.
Fitting and support
Professional fitting available at Nforcd in Warwickshire. Request a fitting quote at Sales@nforcd.com. We are happy to help with guidance on BMW G01 G02 valved catback fitment, OPF solutions and Valvetronic setup.
Warranty
Stone Exhaust 2 year warranty.
Part numbers
- AP543B for B48 engine
- AP543NB for B46 engine
SEO and search terms
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