Competition Series 4" Catless Downpipe for the X1/X3/X4/Z4 N20 (4 Cylinder) Engine Finish:Polish Finish Introducing our Sports Series 4"

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

Hard anodizing helps improve durability of intercooler piping

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

our charge pipe come with two 1/8" NPT threaded bung (for methanol or nos injectors) welded to our charge pipe

Competition Series 4" Catless Downpipe for the X1/X3/X4/Z4 N20 (4 Cylinder) Engine Finish:Polish Finish Introducing our Sports Series 4"Introducing 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