Stone Exhaust Mercedes-Benz A-Class W176 Cat-Back Valvetronic Exhaust System for M270 Engines (A180, A250, A250 4MATIC)
Transform the sound, response and character of your Mercedes-Benz A-Class W176 with the Stone Exhaust Cat-Back Valvetronic exhaust system. Designed specifically for the M270 engine found in A180 and A250 models, this premium valved cat-back exhaust delivers a deeper, sportier tone, sharper throttle response and true OEM-level fitment. Stone Exhaust engineers 3D scan the factory system to reverse engineer every curve and bend, ensuring precise alignment and a perfect bolt-on upgrade for your 5-door hatchback A-Class.
Whether you are searching for Mercedes A-Class W176 exhaust, A250 cat back, A180 exhaust upgrade, valved exhaust for A250, or Mercedes M270 performance exhaust, this Stone Valvetronic cat-back is the quality, plug and play solution enthusiasts trust in the UK.
Why choose this Stone Exhaust Cat-Back for Mercedes A180 and A250
- Dedicated fitment for Mercedes-Benz A-Class W176 with M270 engine: A180, A250, A250 4MATIC, A250 Sport
- Valvetronic system with remote control: On, Off and Auto modes for instant sound control
- Plug and play OBDII controller for quick, simple installation and valve operation
- 3D scanning and reverse engineering for true OEM fitment and alignment
- Machine welding and advanced manufacturing for strength, durability and a premium finish
- In-house R&D and dyno-developed for proven performance gains and optimised flow
- Eliminates the drone often found on the standard exhaust at cruising speeds
Valvetronic control at your fingertips
The Stone Valvetronic system gives you total control over your A-Class exhaust note. Use the remote to switch between:
- On: valves open for maximum sound and flow
- Off: valves closed for a refined, neighbour-friendly drive
- Auto: set a predefined RPM so the valves open and close automatically as you drive
The controller connects to the OBDII port for a tidy, plug and play install that can be completed in minutes.
Developed the right way
Stone Exhaust combines 3D scanning, reverse engineering and 7-axis CNC bending to produce precise, smooth pipework with exceptional roundness and accuracy. Crisscross and overlapping welding techniques, along with direct spot welding, increase penetration and strength at high-heat connection points. The result is a beautifully finished cat-back exhaust for the Mercedes A-Class W176 that flows better, sounds better and lasts.
OPF delete option
For OPF-equipped cars, Stone offers a free OPF delete solution so you can run this cat-back without triggering error codes. This avoids the need to code out OPF errors on the ECU.
Real-world results
We have fitted and run this Stone Valvetronic cat-back on customer A180 and A250 W176 cars, and feedback has been outstanding. Owners love the deeper, sporty tone with valves open, the refined cruising with valves shut, the lack of motorway drone and the spot-on OEM fitment. It is exactly the sound and performance upgrade Mercedes A-Class enthusiasts are looking for.
Compatibility
M270 engine Mercedes-Benz A-Class W176:
- A180 BlueEFFICIENCY 2012+
- A250 BlueEFFICIENCY 2012+
- A250 4MATIC BlueEFFICIENCY 2013+
- A250 Sport 2012+
Installation and fitting
Direct replacement cat-back with OEM-style fitment. Professional installation recommended.
Prefer us to fit it for you? Nforcd offers expert fitting in Warwickshire. Request a quote at Sales@nforcd.com.
Manufactured by
Stone Exhaust
Warranty
Stone Exhaust 2 Year Warranty
See and hear it in action
STONE Exhaust Mercedes-Benz AMG M270 W176 250 Cat-Back Valvetronic Exhaust System SOUND:
Stone Valvetronic System Installation:
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