Competition Series 4" Catless Downpipe for the X1/X3/X4/Z4 N20 (4 Cylinder) Engine Finish:Polish Finish Hard anodizing helps improve durability

Hard anodizing helps improve durability of intercooler piping

Since the June 2009+ models charge pipes include what is known as "the meth elbows"

The radiator fan and radiator shrouding extend from the radiator above

Introducing our Sports Series 4" High Flow Catted Downpipes for your 2020-24 M135iX B48 four-cylinder turbo engine

The G Chassis M3/M4 utilize a Y style mid pipe

Competition Series 4" Catless Downpipe for the X1/X3/X4/Z4 N20 (4 Cylinder) Engine Finish:Polish Finish Hard anodizing helps improve durabilityIntroducing our Competition Series 4" Downpipes for the 2011 15 X1 s xDrive28i 20i 16i, 2011 17 s xDrive28i 20i 18i, 2014 18 X4 xDrive28i 20i 18i and 2011 16 Z4 sDrive28i 20i 18i N20 (4 Cylinder) Engine. Key Features: Made in the USA! Manufactured in house. Now available for the 2011 15 X1 s xDrive28i 20i 16i, X3 s xDrive28i 20i 18i, X4 xDrive28i 20i 18i and 2011 16 Z4 sDrive28i 20i 18i N20 Engines! Horsepower gains of 14 to 16whp average (gains will