Skunk2 07-11 Honda Civic Si Big-Bore Throttle Body Cold-Air Intake Coupler (84mm to 90mm) turn14-in-stock then this is the kit

then this is the kit for you

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Skunk2 07-11 Honda Civic Si Big-Bore Throttle Body Cold-Air Intake Coupler (84mm to 90mm) turn14-in-stock then this is the kitManufacturer Part # : 943 05 0100 Market Description Skunk2s 84mm 90mm Big Bore Throttle Body Cold Air Intake Coupler allows for easy installation of Skunk2s '06 '11 Civic Si Cold Air Intake when using a Pro Series Throttle Body or similar (also compatible with OEM TL throttle body). Simply replace the Cold Air Intake systems included silicone coupler with Skunk2s 84mm 90mm version for a simple, factory like fit. Product Description Short Skunk2 07 11