OFS B58 Downpipe Upgrade 2016+ BMW M240i/340i/440i/540i/740i & xDrive

We are proud to introduce our OFS race downpipe for your B58 M240i, 340i, 440i, 540i, 740i & xDrive variants. These downpipes are THE best bang for the buck mod available for your B58.

Back pressure is significantly reduced by eliminating the restrictive catalytic converter in the factory downpipe with our race cat which results in faster spool, an increase in power & a more aggressive exhaust note. Our downpipe features a full 4.5″ stainless steel design as well as a CNC 304 grade stainless steel flange that offers a smooth transition from the turbo to the mid pipes. 

OFS 4.5″ F20/F30/F31/F32/F33/F34/F36/G30/G11/G12 B58 Stainless Steel Downpipe

• Made from hand-crafted, tig welded 4.5″ 304 grade stainless steel.
• Fits RHD and LHD models with no modification necessary.
• Smooth radius bends to decrease turbulence and increase flow.
• Fits the stock catback as well as all aftermarket catbacks.
• Gains from 25-30hp with tune.