Williams Performance 4.5" B58 Downpipe BMW M140i M240i 340i 440i
4.5" Decat downpipe will improve turbo spool by massively reducing any turbo back pressure when compared to a catted downpipe.
Made from stainless steel and comes heat wrapped using Lava Wrap by Heatshield Products.
Also included is a Genuine BMW turbo-downpipe gasket.
Fitting of this item is also available at our workshop in Northumberland, North East England.