BBK 17090 85mm Throttle Body - High Flow Power Plus Series for GM LS1 Camaro, Firebird, GTO GM Full Size 4.8L,5.3L, 6.0L BBK is your Number One Aftermarket Performance Brand in the USA - American Designed and Built High Flow Power Plus Series 85mm Throttle Body Increases Airflow to Improve Horsepower and Throttle Response Over Stock Recommended For More Modified Vehicles Where Modifications Have Been Made Especially Cold Air Intakes and Exhaust All New CNC Machined Casting Assembled with Components that Exceed OEM Standards, They Will Offer Years of Trouble Free Performance Simple Direct Bolt on Replacement for Factory Unit, Kit Includes High Flow adapter Plate Fits Camaro, Firbird, 04 Gto and 99-02 GM Trucks 4.8,5.3,6.0L