The GM LS-based engine has been embraced by hot rodders, muscle car fans and racers alike. However, trying to retrofit the factory EFI system into a street rod or muscle car creates a number of challenges from wiring to programming. Intimidating electronics and bulky wiring harnesses can quickly clutter the engine compartment and hurt the aesthetics of any hot rod. The massive factory ECU is not only a hassle to mount, but the sheer amount of wiring that goes along with it is simply overwhelming. MSD’s Atomic LS EFI systems are designed to eliminate the intimidation and clutter when installing aftermarket EFI on an LS engine.