VRSF 3.5″ Catless Downpipe for N55 35i F25/F26
  • VRSF 3.5″ Catless Downpipe for N55 35i F25/F26

VRSF 3.5″ Catless Downpipe for N55 35i F25/F26


Catless downpipe for the BMW X3/X4 35i with the N55. Gains instant power with this bolt-on.


The VRSF 3.5″ downpipe upgrade is THE best bang for the buck mod available for your N55 BMW. By eliminating the restrictive catalytic converter in the factory downpipe, back pressure is significantly reduced which results in faster spool, an increase in power & a more aggressive exhaust note. Our downpipe also features a unique CFD optimized cast merge collector which offers the smoothest turbo to mid pipe transition available.

Every VRSF downpipe is hand crafted from tig welded, mandrel bent, 304 grade stainless steel. High quality replacement hardware and mid-pipe gaskets are included although we highly recommend purchasing the optional turbo clamp and gaskets if your car has more than 60k miles.

  • Made from hand crafted, tig welded 3.5″ 304 grade stainless steel.
  • Compatible with both right hand drive and left hand drive vehicles.
  • CFD optimized, cast stainless steel merge collector.
  • Smooth radius bends to decrease turbulence and increase flow.
  • CNC SS304 stainless steel flanges.
  • Gains from 25-30hp with tune.
  • Gaskets & mounting hardware included.
  • VRSF lifetime warranty

This item fits the following BMWs:

2011 – 2017 BMW X3 xDrive35i F25 w/Pneumatic Wastegate
2014 – 2018 BMW X4 xDrive35i F26 w/Pneumatic Wastegate


Data sheet

Part number
OE Part number
18328603873, 8603873

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