2002-2005 Honda Civic Si/SiR 2.0L DOHC Engines Exhaust Manifold HeaderExhaust Manifold Header Fit for Honda Civic Si SiR 2. 0L 2002 2005 Fit RSX 2002 2006 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