EFI Terminator X Stealth GM LS 4150 - Black - 58X Crank - 4 Injectors - 650 HPHolley EFI Terminator X Stealth GM LS 4150 Black 58X Crank 4 Injectors 650 HP Overview The Terminator X Stealth 4150 EFI system from Holley features 4, 100LB HR Fuel Injectors capable of supporting up to 650 HP naturally aspirated or 600 HP on forced induction applications. The Terminator X ECU features fuel maps that self learn and integrated ignition timing control, yielding improved idle stability, drivability, and horsepower at wide open throttle!