2012-UP BMW N55 F30 F32 F33 F20 F21 Turbo Competition Series 4" Catless Downpipe (Brushed)
BM-EXH007 / BM-EXH012
Competition Series 4" Downpipes for your 2012+ 335i (F30 Chassis) six cylinder N55 turbo engine, 2013+ 435i (F32/F33 Chassis) six cylinder N55 turbo engine and 2012+ M135i (F20/F21 Chassis) six cylinder N55 turbo engine
Between 2013-2014 BMW changed the downpipe features.
Please read below important notes:
The F Series (1,2,3,4 Series) N55 cars all share the same downpipe. When first introduced, the downpipes had a 3.5" v-band flange intlet on the turbocharger side. On 07/13, BMW decided to change the downpipe. This new downpipe featured a 4" v-band flange inlet instead. Thus, the previous downpipes are not compatible with the new ones.
Below is the breakdown on which downpipe to chose based on production date:
335i (U.S. Spec) - Up to 07/13 have the old downpipe (BM-EXH007)
After 07/13 have the new downpipe (BM-EXH012)
435i (U.S. Spec) - All 435i have the new downpipe (BM-EXH012)
M235i (U.S. Spec) - All M235i have the new downpipe (BM-EXH012)
M135i (European Spec) - Up to 07/13 have the old downpipe (BM-EXH007)
After 07/13 have the new downpipe (BM-EXH-012)
IF THE VEHICLE IN QUESTION IS BUILT ON 07/13, IT CAN HAVE EITHER DOWNPIPE. A VIN# CHECK SHOULD VERIFY WHICH DOWNPIPE IT IS. TO BE ABSOLUTELY SURE, A VISUAL INSPECTION NEEDS TO BE DONE. SINCE THE FACTORY PART# ON THE DOWNPIPES ARE DIFFICULT TO SEE, THE BEST WAY TO CHECK IS TO LOOK AT THE PART# ON THE BRACKET HOLDING THE DOWNPIPE. THE OLDER DOWNPIPES HAVE 2 STUDS GOING INTO THE BRACKET AND ATTACHED BY 2 NUTS. THE NEWER DOWNPIPE HAS 1 STUD ON TOP ATTACHED BY A NUT. THE BOTTOM BRACKET IS ATTACHED WITH A BOLT, NOT A NUT.
SHOWN WITH BRUSH FINISH
IMPORTANT: THIS ITEM IS INTENDED FOR RACE OR COMPETITION USE ONLY
Restrictions in the exhaust system robs horsepower and torque especially on turbocharged cars. Thus, removing as much exhaust flow restrictions will increase horsepower and torque significantly. The factory catalytic converter found in the factory downpipe is a big culprit of this and is a major exhaust flow restriction. The factory catalytic converter is made up of catalyst material formed into "honeycomb" weaves. Exhaust gas must pass through these tiny "honeycomb" weaves on their way to the exhaust system thus causing a major exhaust flow restriction. It also causes turbulence after the catalytic converter which causes the exhaust flow to slow down (which increases restriction). By replacing the factory downpipe/catalytic converter with our Competition Series 4" Catless Downpipe, more power is unleashed! You will feel the difference instantly.