02-05 Subaru Impreza WRX EJ20 Intake ManifoldSubaru WRX EJ20 polishing Aluminum Turbo intake manifold These manifolds offer excellent spool up characteristics and huge top end power increases over the factory intake manifold. Featuring a velocity stack design, and CNC machined flanges. Weighing in at a scant 6lbs vs the factory's portly 15 pounds. The primary function of the intake manifold is to evenly distribute the combustion mixture (or just air in a direct injection engine) to each intake