VRSF BMW B58 4.5" Catless Downpipe (M140I, M240I, 340I, 440I & 540I)The VRSF 4. 5" catless downpipe for your B58 M140i M240i 340i 540i 440i 740i & xDrive variants. This 4. 5" downpipe is the best value modification available. By eliminating the restrictive catalytic converter in the factory downpipe, back pressure is reduced significantly which results in a faster spool, an increase in power & a more aggressive exhaust note. The VRSF catless downpipe features a full 4. 5" stainless steel design as well as a CNC 304
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