Terminator X Stealth EFI System - 4150 GM 58X LS

The Terminator X Stealth EFI System - 4150 GM 58X LS is Holley's complete bolt-on engine management solution designed for LS-platform swaps and restorations where OEM computers won't cut it. Built for enthusiasts and professional builders who demand plug-and-play simplicity without sacrificing tuning capability, this system eliminates the complexity of traditional carburetor setups while providing modern fuel injection efficiency.

Whether you're dropping an LS into a classic hot rod, street machine, or custom build, the Terminator X delivers reliable cold-start performance, smooth idle quality, and consistent cruise characteristics right out of the box. This self-tuning EFI system features the 4150-style intake flange, making it a direct fit for applications expecting carburetor footprints while operating as a true fuel-injected engine.

The Stealth variant runs closed-loop operation using the GM 58X crank trigger sensor pattern, allowing the system to automatically compensate for air density, fuel quality, and engine wear without manual mapping. Holley's onboard logic monitors oxygen feedback and adjusts fuel trim across the entire rpm range, ensuring drivability from idle through wide-open throttle while maintaining emissions compliance for street-driven vehicles.