For the N54Finally the wait is over for the aFe Power Cat-Delete Race Downpipes for the 1-series and 3-series BMW's with the N54 twin turbo motor. The 335i and 135i come very detuned from the factory using a very restrictive exhaust system. Adding a set of aFe Power Cat-Delete Race Downpipes eliminate the catalytic converters for maximum exhaust flow and power! aFe dyno tested these downpipes, giving the N54 motor an increase of 28hp and 28lbs. x ft. torque over the factory down tubes. These aFe high performance downpipes are made from only using top of the line materials. Using lightweight, TIG-welded 2-3/4" brushed finish 304 stainless steel and use thick 3/8" 304 stainless steel flanges, giving you a leak-free seal and a factory fit. Take your 135i or 335i to the next level in performance with a set of aFe Power Cat-Delete Race Downpipes.
For the N55
Introducing the newest downpipe from aFe, the BMW N55 Downpipe for the 2011+ 135i, and 335i. This downpipe system is 100% bolt-on and provides gains of up to 14 hp and 39 Ft./Lbs of torque with no additional modifications! Made from 304 stainless steel, the aFe BMW N55 Downpipe will not only produce performance gains but is designed to last the entire life of your BMW. To minimize drone, this downpipe uses a unique resonance chamber. The downpipe produces an aggressive tone when on the throttle, without droning at cruising speeds. To complete the aFe N55 Downpipe all of the welds are 100% TIG welded. We recommend an aftermarket tuner to clear the check engine light.