Stone Exhaust Mercedes-Benz M133 X156 GLA45 AMG Cat-Back Valvetronic Exhaust System
Transform the sound and response of your Mercedes-Benz GLA45 AMG with the Stone Exhaust Valvetronic Cat-Back Exhaust System. Developed for the M133-powered X156 GLA45 AMG, this premium cat-back delivers a deeper, crisper AMG exhaust note, eliminates unwanted drone, and offers instant valve control for daily driving comfort and track-ready aggression.
Stone Exhaust has been perfecting performance exhaust systems since 1998. Each system is 3D scanned from the OEM parts for precise reverse engineering, ensuring 100% OEM fitment and consistent quality. In-house dyno development and meticulous manufacturing techniques give you a GLA45 exhaust that sounds right, fits right, and performs right.
Why choose this GLA45 AMG exhaust
- Purpose-built for Mercedes-Benz GLA45 AMG X156 with the M133 engine
- Valvetronic cat-back exhaust with remote ON / OFF / AUTO modes
- Plug and play OBDII controller for rapid, hassle-free setup
- Eliminates drone compared to the standard exhaust system
- One-piece design with machine welding for strength and consistency
- 3D scanning and reverse engineering for exact OEM-level fitment
- Dyno developed in-house for proven performance and sound quality
Valvetronic control. Your exhaust, your way
The supplied Valvetronic remote puts you in control with three modes: ON, OFF, and AUTO. Open or close the valves at the press of a button, or set AUTO to open at a predefined RPM for the perfect balance of sound and civility. The Stone Valvetronic controller is plug and play via the OBDII port, so installation is clean and quick.
Engineered for precision and longevity
- 7-axis CNC bending achieves exceptional roundness to optimise flow
- Crisscross and overlapping welding techniques enhance durability at high-heat joints
- Direct spot welding by mechanical arms for superior penetration and consistency
- Integrally moulded sections designed to minimise flow disruption
OPF delete available
Running a GLA45 AMG with OPF/GPF? Stone offers an OPF delete solution that can be included free of charge on request. This allows installation of the Stone cat-back on OPF-equipped cars without triggering error codes, removing the need to code out the OPF on the ECU.
Fitment and installation
Designed specifically for the Mercedes-Benz X156 GLA45 AMG with the M133 engine. For professional fitting, speak to the performance specialists at Nforcd in Warwickshire. Request a fitting quote: Sales@nforcd.com.
Part number
MO504NS
Manufacturer and warranty
Manufactured by Stone Exhaust. Backed by a Stone Exhaust 2 Year Warranty.
What our team thinks
We’ve installed Stone Valvetronic systems on AMG platforms and have been consistently impressed with the OEM-level fitment, build quality, and the way the valve control transforms the drive. It is a popular upgrade with our GLA45 customers who want a premium exhaust note without the drone.
Video
Stone Valvetronic System Installation
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