VRSF 4.5" Cast Stainless Steel Downpipe | G01 X3 M40i · G02 X4 M40i Variant:Catless (Track Limited Racing) and connects to your factory

and connects to your factory exhaust

monitor live gauge data

APR K04-001 Turbo Kit

In some extreme cases

Stage 1 E30 octane: 31% HP / 41% TQ

VRSF 4.5" Cast Stainless Steel Downpipe | G01 X3 M40i · G02 X4 M40i Variant:Catless (Track Limited Racing) and connects to your factoryWe are proud to introduce our VRSF race & catted downpipe for your B58 X3 M40iX & X4 M40iX. This downpipe is THE best bang for the buck mod available. This downpipe is available in both race & catted configuration. Back pressure is significantly reduced by eliminating the restrictive catalytic converter in the factory downpipe with our race or high flow 200 cell race cat which results in faster spool, an increase in power & a more aggressive exhaust