Blue 3Ply Silicone 2.75"-3.00" Reducer Coupler Hose for Turbo/Intake/Intercooler Effective Diameter Range_3.93" - 4.25" (100mm-108mm) Blow-Off valves use a combination

Blow-Off valves use a combination of manifold pressure signal and spring force to detect when the throttle is closed

HPS 2-1/4" (57mm)

HPS 3-1/2" - 4" (89mm - 102mm)

HPS 4-1/8" (105mm)

Recommend to use on HPS hoses with inside diameter range from 1-1/4" - 1-7/8" (32mm - 48mm)

Blue 3Ply Silicone 2.75"-3.00" Reducer Coupler Hose for Turbo/Intake/Intercooler Effective Diameter Range_3.93" - 4.25" (100mm-108mm) Blow-Off valves use a combinationOur auto performance hose can be used with a variety of pipe sizes and bends. Whether you are looking for a transition reducer, straight, or angle hosed, we has the perfect silicone couplers for you. it will provide efficient heat reduction to increase pressure and tolerance, that you know they are durable and can withstand the toughest conditions. Our performance hose couplers will provide your engine with a one of a kind advantage in performance and