Stone Exhaust BMW S58 G80 G82 G83 OEM Integrated Valved Cat‑Back Exhaust System for M3 and M4
Transform the sound and response of your BMW G80 M3 or G82 G83 M4 with the Stone Exhaust OEM Integrated Valved Cat‑Back Exhaust System. Designed specifically for the S58 engine, this premium valved cat back exhaust delivers an addictive exhaust note with everyday refinement. It retains full OEM valve control via the ECU for true factory integration and seamless drive modes. If you want a BMW M3 exhaust or BMW M4 exhaust that sounds right, fits right and performs, this is the upgrade.
Developed with 3D scanning, reverse engineering and in‑house dyno testing, the Stone Exhaust catback is built for precision fitment and reliable performance. At Nforcd we have fitted and used this system on customer G80 M3 and G82 G83 M4 cars and feedback has been excellent. Crisp cold starts, a deep tone in Sport modes, and civilised cruising without the drone you get from many aftermarket systems.
Why choose this BMW M3 M4 valved cat back
- OEM integrated valves - the factory ECU opens and closes the valves automatically
- Optional Stone Valvetronic System available - dual valves with remote control for manual open or close
- Plug and play OBDII controller for the Valvetronic option
- One piece design with machine welding for durability and perfect alignment
- 3D scanning and reverse engineered from the OEM S58 exhaust for 100 percent OEM fitment
- Dyno developed in house for proven performance with the Stone signature sound
- Eliminates the drone commonly found on standard systems
Engineered for the S58 platform
Stone Exhaust uses advanced R&D to optimise gas flow and sound quality for the S58 twin turbo engine found in the G80 M3 and G82 G83 M4. The system is formed with a 7 axis CNC bending machine that achieves up to 98 percent roundness and exceptional accuracy. Combined with crisscross and overlapping welding, direct spot welding and meticulous quality control, you get a BMW G80 M3 exhaust or BMW G82 M4 exhaust that looks as good as it sounds.
OEM Integrated Valves vs Stone Valvetronic
- OEM Integrated Valves - behaves like stock. The car controls valve position based on drive mode and load for daily drivability.
- Stone Valvetronic System - optional upgrade. Dual valves controlled by the Stone remote via a plug and play OBDII controller so you choose loud or quiet on demand.
Compatibility - S58 engine
BMW M Series
- G80 M3 and M3 Competition 2020+
- G82 M4 and M4 Competition 2020+
- G83 M4 and M4 Competition Convertible 2020+
Part number
AP554Q
Installation and support
Professional fitting is recommended. Nforcd offers in‑house installation at our Warwickshire workshop. Request a fitting quote: Sales@nforcd.com.
Compatibility check before dispatch
We verify compatibility before shipping. Provide your UK registration or the last 7 digits of your VIN at checkout so we can confirm this BMW S58 cat back exhaust fits your vehicle.
Manufactured by
Stone Exhaust
Technical development highlights
- 3D scanning and reverse engineering of the OEM S58 exhaust layout
- 7 axis CNC bending for precision pipe geometry and flow
- Crisscross and overlapping weld techniques for strength at high temperature zones
- Direct spot welding with mechanical arms for consistent penetration and finish
- Integrally moulded sections for accuracy and leak‑free performance
Video and images
Popular searches and keywords
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