Stone Exhaust Mercedes-Benz AMG M133 C117 and X117 CLA45 and CLA45 Shooting Brake Cat-Back Valvetronic Exhaust System
Upgrade your Mercedes-Benz CLA45 AMG performance and sound with the Stone Exhaust Valvetronic Cat-Back exhaust system for the M133 engine. This cat-back exhaust delivers the aggressive AMG soundtrack you want with zero drone on the motorway, plus everyday refinement with on-demand valve control. Developed using 3D scanning, reverse engineering and in-house dyno testing, it is engineered for precise OEM fitment and proven gains.
At Nforcd we have fitted and used this system ourselves and our CLA45 customers absolutely love the deeper tone, crisp upshifts and the ability to switch between quiet and loud in seconds. If you are searching for a Mercedes CLA45 AMG cat-back exhaust, CLA45 performance exhaust, CLA45 Valvetronic exhaust, C117 CLA45 exhaust, X117 CLA45 Shooting Brake exhaust or M133 AMG exhaust upgrade, this is the premium solution.
Why choose the Stone Valvetronic Cat-Back for CLA45 AMG
- Mercedes-Benz AMG M133 CLA45 and CLA45 Shooting Brake cat-back exhaust for C117 and X117 chassis
- Valvetronic system with remote control - ON, OFF and AUTO modes for daily comfort and race-inspired sound on demand
- Plug and play OBDII controller - installs in minutes and lets you open and close the valves at the touch of a button
- AUTO mode allows custom valve opening at your chosen RPM
- Eliminates drone found on the standard factory exhaust system
- One-piece precision engineered design for optimum flow and reliability
- 3D scanning and reverse engineered from OEM for perfect fitment
- In-house R and D and dyno developed for proven performance improvements
- Mechanical welding with crisscross and overlapping techniques for strength at high-heat zones
- Direct spot welding with robotic precision for durability and consistency
- 7-axis CNC bending for exceptional roundness and reduced airflow obstruction
OPF delete option
Stone offers an OPF delete that can be included free of charge. This allows you to install the Stone cat-back exhaust system on OPF-equipped cars without throwing an error code, so coding out the OPF warning on the ECU is not required.
Engineered for performance and sound
Stone Exhaust engineers 3D-scan the OEM Mercedes-Benz AMG M133 CLA45 system to analyse pipe diameter, routing and bend angles. Using advanced simulation, they optimise exhaust gas flow, temperature and pressure zones to extract performance while creating that signature Stone exhaust note. With the Valvetronic remote, switch instantly between quiet and loud, or let AUTO mode open the valves at your chosen RPM for the perfect mix of comfort and excitement.
Built with precision
The 7-axis CNC bending process achieves up to 98 percent roundness with minimal outer bore wear at 180 degrees, helping prevent airflow disruption and reducing the risk of weld fractures. Combined with crisscross and overlapping welding at high-heat zones and direct spot welding by mechanical arms, the end result is a robust, high-quality cat-back exhaust that looks as good as it sounds.
Compatibility
M133 engine:
- Mercedes-Benz CLA-Class C117 CLA45 AMG 4MATIC
- Mercedes-Benz CLA-Class X117 CLA45 AMG 4MATIC Shooting Brake
Part number
MP510S
Installation and fitting
The Stone Valvetronic system is plug and play via the OBDII port and can be installed within minutes for valve control. For professional fitting of your cat-back exhaust, we recommend booking with Nforcd in Warwickshire. Request a fitting quote at Sales@nforcd.com.
Photos
Manufactured by
Stone Exhaust
Warranty
Stone Exhaust 2 Year Warranty
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