This is the Atomic EFI kit to get if your vehicle already has an electric fuel pump with a return line in place, you might not need to replace it. Or if you are planning on using an EFI specific fuel tank with an in-tank pump. If this situation fits your car, consider the Throttle Body Kit which comes with the Throttle Body, Power Module (with Wide Band O2 sensor), and Handheld Controller.
NOTE: For an existing fuel system to work with the Atomic, we recommend the system be able to maintain 42psi constant and use 3/8" or “Dash 6" fuel line rated for EFI. The Atomic can support a return fuel line if needed for your application.