Exhaust Manifold Header Fit 3 Series BMW E92 E93 2007-2013 N52 325i 328i 330iExhaust Manifold Header Fit for 3 Series BMW E92 E93 2007 2013 N52 325i 328i 330i Feature: 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