The exhaust manifold found on the 2002-2007 Subaru Impreza WRX 4 Cylinder Engines were designed to combine the exhaust gasses from each of the cylinders quickly with a manifold that was cost effective to produce. Our 4-1 off-road racing headers are designed to allow the exhaust gasses to flow more freely from each cylinder and combine in a more efficient manner. Tubing has been optimized for the 2.0L engine. This creates a reduction in cylinder backpressure and improved exhaust gas velocity. These improvements free up lost horsepower and torque. An added benefit is a more performance oriented exhaust sound.
1 x Set of Header Exhaust System, Gasket(s) and Bolt(s)(ALL if any is necessary for Installation)
02-07 Subaru Impreza WRX/ STi GD/ GG