Stone Exhaust Mercedes-Benz CLA200 and CLA250 Cat-Back Valvetronic Exhaust System for M270 C117 and X117
Looking for the best Mercedes CLA200 exhaust or CLA250 exhaust upgrade in the UK? This Stone Exhaust Valvetronic Cat-Back system is a proven performance exhaust for the Mercedes-Benz C117 CLA and X117 CLA Shooting Brake with the M270 engine. It delivers a deeper, sportier tone without drone in Comfort, and an aggressive soundtrack when the valves are open. Perfect OEM fitment, premium build quality, and genuine everyday usability make this the ultimate cat back exhaust for CLA200 and CLA250 owners.
Developed by Stone Exhaust using 3D scanning and reverse engineering of the OEM system, this catback exhaust is designed for precision fitment on M270 models and dyno-developed in-house for noticeable performance gains and sharper throttle response. If you want a valved exhaust for Mercedes CLA, a CLA250 cat back, or a CLA200 valvetronic exhaust that transforms sound and driving feel, this is the one we recommend.
Why choose this Mercedes CLA Cat-Back Valvetronic Exhaust
- Direct-fit cat back exhaust for Mercedes-Benz CLA C117 and X117 with M270 engine, including CLA200 and CLA250 models
- Valvetronic valved exhaust with remote control - ON, OFF and AUTO modes for quiet cruising or loud, race-inspired sound
- Plug and play OBDII controller included - quick installation and easy valve control
- Eliminates the drone often found on standard exhaust systems
- One piece design with precision machine welding for strength and reliability
- R&D driven: 3D scanning, reverse engineering and in-house dyno development
- 7 axis CNC bending for optimal flow and exceptional roundness
- Crisscross and overlapping welding technique and direct spot welding for durability at high temperatures
- Stone signature sound - refined with valves closed, aggressive with valves open
Valvetronic remote control, plug and play
The Stone Valvetronic remote offers ON, OFF and AUTO modes so you decide when to run quiet or loud. In AUTO mode you can set a predefined RPM for the valves to open automatically. The system is plug and play via the OBDII port and can be installed in minutes.
OPF delete compatibility
Stone offers an OPF delete option that can be included free of charge. This allows installation of the Stone cat back exhaust on OPF-equipped cars without triggering an error code, so ECU coding to remove OPF faults is not required.
Engineered for performance and perfect fit
Stone Exhaust engineers use OEM 3D scanning to capture pipe diameter, routing and bending angles, then simulate exhaust gas flow, thermal zones and pressure areas to optimise performance. The 7 axis CNC bending machine achieves up to 98 percent roundness with minimal outer bore wear at tight bends, reducing turbulence. Advanced welding techniques at high-stress joints increase endurance and reliability for long-term performance.
Real-world results you can hear
We have fitted and used this Stone Exhaust system on customer Mercedes CLA200 and CLA250 builds, and the feedback has been consistently excellent. Customers love the sound quality, the ability to switch from quiet to loud with the remote, the lack of drone on the motorway, and the precise OEM-level fitment.
Compatibility - Mercedes-Benz CLA M270
- C117 CLA200 2013+
- C117 CLA250 2013+
- C117 CLA250 4MATIC 2014+
- C117 CLA250 Sport 4MATIC 2014+
- X117 CLA250 Shooting Brake 2015+
Part number
MP503S
Warranty
Stone Exhaust 2 year warranty.
Professional fitting
Want this Mercedes CLA cat back exhaust professionally installed? Book fitting with Nforcd in Warwickshire. Email Sales@nforcd.com for a quote and availability.
Keywords to help you find the right upgrade
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Photos
Videos
Mercedes-Benz C117 M270 CLA250 Stone Exhaust Sound
In-depth R&D and build
Installation support
DIY-friendly with the plug and play OBDII controller, or let us handle it. For expert fitting at Nforcd in Warwickshire, email Sales@nforcd.com for a quote.
Stone Valvetronic System Installation Video