Stone Exhaust engineers use reverse engineering by 3D scanning OEM parts to understand their functionality and identify weaknesses. 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 equipped cars without throwing an error code, thus coding out the OPF error code on the ECU is not required. The Stone Valvetronic system is a plug and play system, and connects to your OBDII port, which can be installed within a few minutes. You can also set it in auto mode for the valves to open at a certain rpm automatically. The Cat-Back Valvetronic System comes with a separate remote controller that gives you full control of the exhaust, allowing you to open and close the valves with a click of a button. With their in-house dyno, your BMW exhaust system is proven to produce more power with the enhanced Stone signature exhaust sound. Stone Exhaust has been developing world's best exhaust system since 1998, starting with 3D scanning and reverse engineering the OEM system, this allows the Stone engineers to design a 100% OEM fitment exhaust with precision. We are proud to introduce you to the state of the art Stone Exhaust Valvetronic Cat-Back Exhaust System, to enhance the performance and sound of your Mercedes-Benz W176 5-door hatchback A180 & A250 with the M270 engine, manufactured after 2013.
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