Stone Exhaust Mercedes-Benz A-Class W177 A250 M260 Cat-Back Valvetronic Exhaust System
Transform your Mercedes-Benz A-Class W177 A250 2.0 M260 with the Stone Exhaust Cat-Back Valvetronic exhaust system. This premium performance exhaust upgrade delivers the aggressive Mercedes A250 exhaust sound you want with everyday comfort when you need it. Engineered for perfect OEM fitment, this A250 cat-back exhaust is 3D scanned, reverse engineered and dyno developed to enhance throttle response, performance and tone while eliminating the dreaded highway drone.
If you are searching for a Mercedes A250 W177 exhaust, A250 cat back exhaust, valved exhaust for A250, or performance exhaust for Mercedes A-Class W177, this Stone Exhaust Valvetronic system is the proven, plug and play solution.
Why choose Stone Exhaust for your Mercedes A250 W177
- Stone Valvetronic Mercedes-Benz M260 W177 A250 Cat-Back Exhaust System
- Valved exhaust with ON, OFF and AUTO modes for comfort or track-style sound on demand
- Plug and play OBDII controller with remote for effortless valve control
- Auto mode can open valves at a set RPM for intelligent, hands-free operation
- One piece design for strength, alignment and durability
- Precision mechanical welding for reliability under heat and load
- 3D scanning and reverse engineering for 100% OEM-like fitment
- Dyno developed in-house for proven performance and optimised flow
- Eliminates drone found on the standard exhaust system
At Nforcd, we have installed this Stone Exhaust Mercedes A250 W177 catback on customer cars and the feedback has been fantastic. With valves closed, it is refined and drone free. With valves open, it delivers an addictive, sporty A250 exhaust note that really brings the M260 engine to life.
Valvetronic control. Quiet when you want it, loud when you don’t.
The Stone Valvetronic system is independently researched and developed in house to maximise reliability. The included remote provides three modes: ON, OFF and AUTO, allowing instant switching based on driving conditions. The plug and play controller connects to your OBDII port and can be installed within minutes, with Auto mode enabling valve operation at a predefined RPM for seamless performance.
OPF delete option for OPF-equipped cars
Stone offers an OPF delete which can be included free of charge. This allows you to install the Stone Cat-Back exhaust system on OPF/GPF equipped cars without triggering an error code, so coding out the OPF error on the ECU is not required.
Engineered for performance and durability
Stone Exhaust starts by 3D scanning and reverse engineering the OEM Mercedes-Benz A250 exhaust to identify improvements in pipe diameter, routing and bend angles. Using advanced simulation, the exhaust gas flow, thermal zones and pressure rise areas are optimised for performance and sound.
7 axis CNC bending
Constructed on a state-of-the-art 7 axis CNC bending machine, Stone achieves up to 98% roundness and exceptional accuracy, reducing airflow obstruction and weld stress. The integrally moulded pipework is built to exacting tolerances for a precise, consistent fit.
Advanced welding techniques
Crisscross and overlapping welding increases penetration and width at high stress points, improving endurance under extreme temperatures. Direct spot welding with mechanical arms enhances precision and strength, resulting in an exhaust that is as robust as it is beautiful.
Sound and installation media
Valvetronic System Installation
Mercedes W177 M260 A250 Stone Exhaust Cat-Back Valvetronic System Sound
Compatibility
- Mercedes-Benz A-Class W177 A250 2018+
- Mercedes-Benz A-Class W177 A250 4MATIC 2018+
Professional fitting
We offer professional fitting at Nforcd in Warwickshire. Request a fitting quote at Sales@nforcd.com.
Warranty
Stone Exhaust 2 Year Warranty
Part number
MP520BS
Fitted photos
R&D in action
