4: The hole is smooth

AR3Z13405B AR3Z13404B AR3Z13404BCP

For BMW 335i xDrive M/T Base 2012

Fit for DAYTONA 675 R 2011-2015 (F-11/T-333)

Nissan & Vauxhall

2003-2008 For Toyota Matrix CRX 2ZZ-GE ENGINES ONLY Exhaust Manifold Header Car Taillight 4: The hole is smoothFeature: 1. Getting more air into your engine and more exhaust out is the key to a performance motor. That's where exhaust headers is significant as the first revenue of an exhaust system. Exhaust performance headers manipulate the air flow with the performance robbing exhaust manifold that came with your car. 2. Headers provide each cylinder with its own mini exhaust pipe, which means exhaust headers prevent interference among cylinders; thus, the