BBK 1548 56mm Throttle Body - High Flow Power Plus Series for Ford Mustang V6 3.8L BBK is your Number One Aftermarket Performance Brand in the USA - American Designed and Built High Flow Power Plus Series 56mm Throttle Body Increases Airflow to Improve Horsepower and Throttle Response Over Stock Recommended For Stock Applications Where Modifications Have Been Made or are Planned 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 with Simple Hand Tools in Less Than Half an Hour