BMW F80 M3 & F82/83 M4 (Non GPF Models) - HJS Tuning ECE Downpipes Part_Valved GPF Back The single valved setup utilises

The single valved setup utilises Cobra Sport's race rear silencer

once the module is installed it will default valve behaviour to be as follows

together with a Cobra Sport Turbo Back non-resonated exhaust upgrade with high-flow catalyst

This means a faster revving engine

5mm pipework and fit from the centre section backwards replacing the standard rear section with dual exit tailpipes

BMW F80 M3 & F82/83 M4 (Non GPF Models) - HJS Tuning ECE Downpipes Part_Valved GPF Back The single valved setup utilisesHigh performance, road legal downpipes with sports catalysts made by HJS in Germany. Designed to optimize vehicle power and sound while maintaining full European emission standards with ECE approval. Plug and Play fitment. Sound levels within 2dB of OE.