Competition Series 4" Catless Downpipe for the 5/6 Series N55 (6 Cylinder) Engine Finish:Brush Finish Another added benefit is that

Another added benefit is that by keeping in heat (energy) in the exhaust gases inside the downpipe

GTRS and similar turbo upgrades

The cooling system on the N54 engine is already at its maximum capacity and we have seen overheating issues with both oil and coolant while racing

2013-15 435i (F32/F33 Chassis)

We bring the same thing to the N20 charge pipe

Competition Series 4" Catless Downpipe for the 5/6 Series N55 (6 Cylinder) Engine Finish:Brush Finish Another added benefit is thatOur Competition Series 4" Downpipes for your 2011 16 535i (F10) and 2011 16 640i (F13). Key Features: Made in the USA! Manufactured in house. Available for the 2011+ BMW 535i (F10) with the N55 Engine. Available for the 2011+ BMW 640i (F12 F13) with the N55 Engine. Better throttle response and faster turbo spool up times. Mandrel Bent 4" piping. Smooth transition to the exhaust system. 100% Stainless Steel Construction Stainless Steel Flex Section