THESE ARE CAST ALUMINUM 900CFM HOLLEY THROTTLE BODIES WITH FUEL INJECTORS SELF CONTAINED IN THE UNIT FOR QUICK & EASY CONVERSION TO ELECTRONIC FUEL INJECTION OR OEM REPLACEMENT. THESE UNITS ARE AVAILABLE IN 2 BARREL & 4 BARREL CONFIGURATIONS ALONG WITH 2 & 4 INJECTOR OPTIONS. THESE UNITS FIT STD 4150 FLANGE PATTERN HOLLEY MANIFOLDS AND COME WITH AN IAC AND TPS SENSOR INSTALLED. BOOSTPOWER OFFERS MODIFICATIONS FOR THESE ALONG WITH VARIOUS THROTTLE LINKAGE. CALL FOR MORE INFO. 805-376-6077 M-F 9-5 PACIFIC TIME.