Stone Exhaust Mercedes-Benz AMG M276 C238 Cat-Back Valvetronic Exhaust System for E400, E450 and E43
Upgrade your Mercedes-Benz E-Class C238 with the Stone Exhaust Valvetronic Cat-Back Exhaust System designed for the AMG M276 engine, including E400, E450 and E43 models. This premium valved cat-back exhaust delivers an addictive AMG exhaust note, improved flow and everyday refinement with zero drone. It is the ideal performance exhaust upgrade for the Mercedes E-Class Coupe and Cabriolet looking for a valved, plug and play, OEM-fit solution.
Why choose Stone Exhaust for your Mercedes E-Class AMG C238 M276
Since 1998, Stone Exhaust has engineered performance exhaust systems using reverse-engineered OEM data and 3D scanning to achieve perfect OEM fitment. With in-house R&D, CFD simulation and dyno development, this Mercedes E-Class M276 cat-back exhaust is built for performance, tone and durability. At Nforcd we have supplied and fitted Stone Exhaust systems to customer cars and feedback has been superb on sound quality, build precision and everyday drivability.
Valvetronic control with plug and play OBDII
The Stone Valvetronic system gives you full control of your Mercedes AMG exhaust sound:
- Remote control with ON, OFF and AUTO modes
- Plug and play OBDII controller for quick installation
- Set AUTO to open valves at your chosen RPM for intelligent, hands-free control
- Enjoy quiet cruising with valves closed and a deep, aggressive tone with valves open
This valved cat-back exhaust is engineered to eliminate the drone commonly found on standard systems, making it perfect for daily driving and spirited runs alike.
Key features
- Stone Valvetronic Cat-Back Exhaust for Mercedes-Benz E-Class AMG C238 E400, E450 and E43 with M276 engine
- Valved exhaust system with remote ON, OFF and AUTO modes
- Plug and play OBDII controller included
- One-piece design with precision fitment using 3D scanning and reverse engineering
- In-house research, development and dyno validation
- Eliminates drone for refined motorway cruising
- Mechanical welding with precision, direct spot welding and crisscross overlapping techniques
- 7-axis CNC bending for exceptional roundness and flow accuracy
- Signature Stone Exhaust sound: premium tone with performance character
OPF delete solution available
Running an OPF car? Stone offers an OPF delete solution free of charge, allowing you to fit this Stone cat-back exhaust to OPF-equipped vehicles without triggering an error. No ECU coding required to remove OPF-related warnings.
Engineering and manufacturing
Stone Exhaust engineers 3D-scan OEM systems to analyse pipe diameter, routing and bend angles before optimising flow with 3D simulation for gas velocity, temperature zones and pressure. The result is an OEM-fit catback exhaust for the M276-powered E-Class that looks, fits and performs exactly as enthusiasts expect.
Valvetronic system details
Independently researched and developed in-house, the Stone Valvetronic system avoids complicated wiring and perishable components for long-term reliability. Switch instantly between quiet and performance modes, or let AUTO mode open the valves at your chosen RPM for the best of both worlds.
Precision bending and welding
Stone utilises a state-of-the-art 7-axis CNC bending machine to achieve up to 98 percent roundness and outstanding accuracy. Combined with crisscross and overlapping welding, plus direct spot welding by mechanical arms, the system is built to withstand extreme temperatures and stresses while maintaining optimal flow and structural integrity.
Installation video
Compatibility - M276 engine
Mercedes-Benz E-Class C238
- E400 2017+
- E450 2017+
- E43 AMG 2017+
Suitable for M276 applications, including RHD.
Fitting and support
Want professional fitting for your Mercedes E-Class AMG valved catback exhaust in the UK? Book with Nforcd in Warwickshire. Request a fitting quote at Sales@nforcd.com.
Warranty
Stone Exhaust 2-year warranty.
Part number
MP525AS
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