Competition Series 4" Catless Downpipe for the X1/X3/X4/Z4 N20 (4 Cylinder) Engine Finish:Polish Finish Rubber hosing expands under boost

Rubber hosing expands under boost pressure

The radiator fan and radiator shrouding extend from the radiator above

Hard anodizing helps improve durability of intercooler piping

X6 M60i (G06) and X7 M60i (G07)

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

Competition Series 4" Catless Downpipe for the X1/X3/X4/Z4 N20 (4 Cylinder) Engine Finish:Polish Finish Rubber hosing expands under boostIntroducing 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