VRSF Catted Downpipe BMW M240i 340i 440i 540i B58 Brushed 16-22VRSF Catted Downpipe BMW M240i 340i 440i 540i B58 Brushed (2016 2022) The factory downpipe on the B58 is a restriction that limits what these engines can do. The VRSF Catted Downpipe replaces it with a full 4. 5" SS304 stainless steel unit with a 200 cell high flow race cat, reducing back pressure and delivering 25 30 horsepower gains with a tune, while keeping a catalytic converter in place for street use. ModsDirect supplies this downpipe to BMW
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