Stone Exhaust BMW B58 G11 G12 OEM Integrated Valved Cat-Back Exhaust System for 740i and 740Li
Transform your BMW 7 Series with the Stone Exhaust OEM integrated valved cat-back exhaust system. Designed specifically for the BMW B58 engine in the G11 740i and G12 740Li, this premium performance exhaust delivers a deeper, more refined exhaust note, improved throttle response and exceptional OEM-level fitment. If you are searching for a BMW 740i exhaust, BMW 740Li exhaust, BMW B58 catback, BMW 7 Series G11 G12 valved exhaust or a direct-fit cat back upgrade in the UK, this is the system enthusiasts choose.
Stone Exhaust reverse engineers the factory system using 3D scanning to guarantee true OEM fitment, while in-house dyno development refines performance and sound. The OEM integrated valve functionality retains factory ECU valve control, so you keep the comfort when you want it and the authentic Stone signature tone when you do not. Our customers love the sound quality and the way it eliminates the drone found on the standard exhaust.
Why choose this BMW 7 Series B58 cat-back exhaust
- OEM integrated valved design for factory ECU-controlled valves
- Direct-fit, bolt-on cat-back exhaust with precise OEM-style routing
- Proven in-house dyno development for performance and sound
- Eliminates drone compared with the standard exhaust system
- One-piece design with precision mechanical welding
- Optional Stone Valvetronic System (Single Valve) with plug-and-play OBDII controller for remote valve control
- Developed using 3D scanning and reverse engineering for perfect fitment
OPF delete support
Fitting this exhaust to OPF-equipped cars is made simple. Stone offers an OPF delete that can be included free of charge, allowing installation without triggering an error code. No ECU coding is required to remove OPF-related warnings.
Engineering that sets it apart
3D scanning and reverse engineering
Stone Exhaust engineers collect detailed data to optimise pipe diameter, routing and bend angles for the BMW B58 G11 G12 740i and 740Li. 3D simulation of gas flow, thermal behaviour and pressure zones enables progressive refinement until optimal results are achieved.
7-axis CNC bending
Constructed using a state-of-the-art 7-axis CNC bending machine for aerospace-grade precision. The process achieves an industry-leading 98% roundness and limits outer bore wear to only 25% at 180°, reducing flow disturbance and preventing weld fractures. With CNC bending, reverse engineering and 3D scanning, Stone achieves an integrally moulded pipe with accuracy error under 0.025 mm.
Advanced welding
Crisscross and overlapping welding techniques increase weld width and penetration to withstand extreme temperatures of 800℃ to 1100℃ at critical joints. Direct spot welding by mechanical arms further increases strength and consistency for a durable, beautifully finished performance exhaust.
Recommended add-ons
- Stone Valvetronic System (Single Valve) with remote control via the Stone controller
- Stone Exhaust BMW B58 Catless Performance Downpipe
- Stone Exhaust BMW B58 Eddy Catalytic Performance Downpipe
Compatibility
Engine: BMW B58
BMW 7 Series:
- G11 740i 2014–2019
- G12 740Li 2014–2019
Part numbers
- AP538A – G11 740i
- AP538B – G12 740Li
Manufacturer and warranty
Manufactured by: Stone Exhaust
Warranty: Stone Exhaust 2 Year Warranty
Professional fitting
This system is a direct-fit cat-back, but we recommend professional installation for best results. Nforcd offers expert fitting in Warwickshire. Request a fitting quote at Sales@nforcd.com.
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