Now you can replace your old-style carburetor with modern fuel-injection thanks to Holley's new Avenger EFI throttle body kit. A direct replacement for standard-flange carburetors, the plug-and-play Avenger system features self-tuning capabilities so a lap-top computer is not required. The kits come with all necessary parts for installation, including wiring harness, sensors, in-line fuel pump, and a hand-held tuner that allows users to fine-tune base calibrations. The 900 cfm throttle body supports 375 to 525 horsepower. A fuel line return to the fuel tank must be added.