These FAST EZ-EFI dual quad self-tuning fuel injection systems are offered as upgrades to existing FAST EZ-EFI kits. They add several parts, including a second unique throttle body for use with dual carburetor type manifolds, fuel injectors, and a basic linkage kit that's necessary to connect the two throttle bodies together. Now, your system will be fully capable of supporting up to 1,000 hp with no problem.