Stone Exhaust switchable catback for Mercedes A‑Class W177 A250 and A250 4MATIC M260 2018 on
Give your W177 A‑Class the voice and response it deserves with Stone’s valve‑controlled rear system. This premium catback delivers a deep, sporty tone under load with calm, drone‑free cruising on the motorway. Developed from 3D scan data and refined on the dyno, it bolts up like factory while unlocking sharper throttle feel, improved flow and an addictive soundtrack for the 2.0 turbo M260.
If you are searching for a performance exhaust for Mercedes A250, W177 A250 4MATIC sports exhaust, M260 catback, remote valve exhaust for A‑Class or an OPF friendly upgrade, this is the proven, plug in solution that keeps everyday usability intact.
Key reasons enthusiasts choose this Stone catback
- Valve control with open, closed and automatic modes using the included OBD port module and handheld remote
- Automatic mode can trigger valve opening at a preset engine speed for hands‑free operation
- Refined on the motorway with no cabin boom, aggressive tone on demand when the valve is open
- One‑piece main section for strength, alignment and long term durability
- Precision mechanical welding throughout for reliability under heat and load
- 3D scanned and reverse engineered for true OE‑like fit and finish
- Flow path and pipe geometry optimised on the dyno for response and sound quality
- Supplied ready to install with plug in electronics and remote control
We have fitted this system for customers and the feedback is outstanding. With the flaps shut it is civil and comfortable around town, with the flaps open it brings the M260 to life with a crisp, sporty note that never drones.
OBD controlled, switchable sound
The Stone valve hardware is engineered in house for reliability. The OBD controller plugs into the diagnostic port in minutes and the compact remote gives you instant access to open, closed or auto. Set and forget automatic mode lets the valve open at a chosen RPM for seamless everyday use.
OPF and GPF friendly, with optional OPF delete section
Running an OPF or GPF equipped car. Stone can supply an OPF delete section at no extra cost so you can fit this catback without fault codes, meaning ECU coding is not required.
Engineered to perform and built to last
Stone begins with a full 3D scan of the factory system to identify improvements in routing, diameter and bend angles. CFD‑led optimisation targets gas velocity, hot spots and pressure rise to enhance performance and tone while maintaining comfort.
7‑axis CNC bending
Manufactured on state‑of‑the‑art multi‑axis CNC benders for exceptional roundness and accuracy. This reduces turbulence, minimises weld stress and ensures a consistent, precise fit.
Advanced welding
Criss‑cross and overlapping weld techniques add penetration and width at critical load points. Direct spot welding with mechanical arms delivers repeatable strength and a clean finish.
Fitment
- Mercedes‑Benz A‑Class W177 A250 2018 on
- Mercedes‑Benz A‑Class W177 A250 4MATIC 2018 on
- Engine code M260 2.0T
Professional installation
Want it fitted. Book in with MJ Modifications, Warwickshire. Email info@mjmodifications.co.uk for a quotation and availability.
Warranty
Stone Exhaust 2 year warranty
Part number
MP520BS
Sound and installation videos
Valve control module installation
Exhaust sound on Mercedes W177 A250 M260
In the metal
R and D
Popular search terms
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