Private Label MFG downpipes are designed to improve your turbo charged vehicles performance. Private Label MFG Power Driven BMW 135i/335i/335xi (N55) downpipes are no exception, these pipes are made from 304 stainless steel. They connect to the headers with a 4" diameter opening and V band flange. They have an inside diameter of 2.60". The larger diameter design will improve exhaust flow, keep boost pressure up and provide improved throttle response. This down pipe eliminates the catalytic converters. Each down pipe has 2 oxygen sensor locations. Thick flanges, sturdy hangers and increased flow make these down pipes a must have for all E82 enthusiasts.

The only TRUE 4" catless downpipes currently on the market! 4" tubing until cat-back flange - all systems currently on the market reduce to 2.5" much closer to the turbocharger.
100% Hand Crafted - from premium 304 stainless steel - flanges and O2 bungs included!
Water-jet cut 304 Stainless cat-back flanges, and CNC'd 304 Stainless V-Band flanges.

In addition to an intoxicating and exotic sound, these downpipes add significant power and virtually eliminate turbo lag!



Features:


Brand New In Box
100% TIG welded
Set of our exclusive bomb-proof exhaust gaskets included.
Factory location O2 bungs
4" catless downpipe currently on the market! Built with a carefully made 4" to dual 2.5" collector that mates to the factory style exhaust.
Typical gains with tuning in the 20+hp range!
100% hand crafted from 304 Stainless Steel - flanges and O2 bungs included!
304 Stainless cat-back flanges, and CNC'd 304 Stainless V-Band flange.
100% TIG welded
Exhaust gaskets included.
Factory location O2 bungs, with an added bung for a wideband O2 sensor!
One year limited warranty against any manufacturing defects given to original owner.
One piece design
Mandrel Bent
CAD Designed
100% Guaranteed Perfect Fitment