GReddy Stainless Headers are an excellent Upgrade to the Factory
Manifold. GReddy uses tubular piping which will provide a higher exhaust flow
rate compared to the cast steel manifold. Designed to be a Bolt-On Application,
GReddy Stainless Headers will add 6-10 Horsepower on Naturally Aspirated Engines
while still maintaining CARB Approval. The GReddy Exhaust Manifold for the
Subaru Impreza WRX will add up to 25 Horsepower. and will replace the lower
piping of the Manifold System.
