These progressive 4-barrel throttle bodies bolt directly to standard square-bore or 4500 Series carb mount flanges for competition electronic fuel injection systems based on our Victor Series manifolds. Fully machined by Edelbrock, they are assembled/calibrated by Magneti Marelli USA and include a GM style throttle position sensor (TPS). #3878, #3879, and #3888 include a Delphi/GM idle air control (IAC) motor. #38783, #38793 and #38883 include a Hitachi (PWM) IAC motor (two wire). Standard style air cleaners (5-1/8" or 4500 series) will fit. Available in standard finish. Edelbrock Throttle Body 3888 EFI - Competition - 2.25 in. 4 bbl - For 4500 Series Carb Mount Flange - 2000 CFMLarger Diameter Increases Flow and PerformanceDirect Bolt-On; No Modifications NecessaryManufacture red On Sophisticated MachineryButterflies Are Precision MachinedIncludes New Machined Throttle Position SensorBolts To Stock Or Aftermarket ManifoldAll Stock Sensors And Lines Fit Like StockPit Stop USAoffers Edelbrock Throttle Body 3888 at low everyday prices. Be sure to check out all of the products from Edelbrock including Edelbrock Fuel System and Intake Parts and Accessories, Edelbrock Fuel Injection, Edelbrock Throttle Bodies.