VRSF Catted Downpipe BMW M340i M440i M240i B58 G20 Heat Shield 19-23VRSF Catted Downpipe BMW M340i M440i M240i B58 G20 Heat Shield (2019 2023) The factory downpipe on the B58 G20 is one of the first things holding your M340i, M440i or M240i back. The VRSF Catted Downpipe replaces it with a full 4. 5" SS304 stainless steel unit featuring a 200 cell high flow race cat, reducing back pressure significantly and delivering 25 30 horsepower gains with a tune. Faster spool, more power, and a more aggressive exhaust note,
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