Perrin's stock-sized turbo inlet hose features 5-ply silicon construction for maximum durability. Silicon construction also ensures maximum resistance to heat soak. Perrin's inlet hose is the only design on the market that does not require removal of the intake manifold for installation. Available in red, black, or blue. The factory rubber inlet hose has a corrugated interior, which slows airflow and creates turbulence; the Perrin inlet has a larger inner diameter, and smooth interior for optimal flow. Expect a 5-10hp gain from this part alone. Fits all 2002+ WRXs and STis including 2006 models. For larger inlet turbos, 3" turbo inlet hoses are also available, check our website for details. FITMENT: All 2002+ WRX/STi Models w/ stock-sized turbocharger inlet.