Product Description

We are proud to show our race & high flow catted B58 downpipes for your M240i, 340i, 440i, 540i, 740i & xDrive variants. These downpipes are the best one for your B58 and they're available in both race & high flow versions.

The back pressure of your car is greatly reduced by eliminating the restriction of catalytic converter inside the factory downpipe with our race or high flow 200 cell catalytic converter, which also results in faster spool, more power & more aggressive exhaust note. Our B58 downpipe features a full 4.5″design with a CNC flange that offers a smoother transition from the turbo to the mid pipes. And they're hand crafted from top quality SS304 grade stainless steel.

Let your turbo breathe freely, unlike some other brands that suddenly reduce size halfway on the downpipe, our B58 downpipe diameter stays 4.5" for the most length of it, reducing in size at the very end where it meets the OEM exhaust.