EZ-FEI Kits allow anyone to easily run a GM LS Gen III/IV engine and transmission outside of their original vehicle and factory controller. FAST Kits are the complete "No Headache, No Experience Required" solution to transplanting late model engines into customs, street rods, and muscle cars. Everything is covered, from fuel to spark and from engine through electronic transmissions. Four different stages with three packages each allow you to select the right level of control based on your individual needs. The engine kit combines the revolutionary self-tuning EZ-EFI with bolt-on XIM Coil-On-Plug ignition to give LS applications the easiest, self-tuning electronic fuel injection available. The Engine Kit with Transmission Control combines EZ-EFI and XIM with the EZ-TCU for maximum control over shift points, shift firmness, and shift speed without a laptop or tuning experience. Engine & Intake Manifold Kits add the FAST LSX intake manifold, Big Mouth Throttle Body, fuel rails, sensors & more for a gain of 30+ horsepower. For a complete powertrain control package, Engine & Intake Manifold Kits with EZ-TCU offer the most advanced engine management system on the market today: EZ-FEI, XIM, EZ-TCU, LSX intake manifold, Big Mouth Throttle Body, and fuel rails. All kits work with stock ignition coils.