Holley EFI Terminator X Max Stealth 4150 – Black

Holley EFI Terminator X Max Stealth 4150 – Black

The Holley EFI Terminator X Max Stealth 4150 – Black is a universal bolt-on EFI system designed to replace 4150 flange carburetors on American V8 engines. It supports up to 650 HP naturally aspirated and 1250 HP with forced induction, offering advanced self-tuning fuel maps and integrated ignition timing control for improved idle, drivability, and power.

Key Features

• (8) 100 lb/hr fuel injectors for up to 1250 HP on forced induction
• 3.5” handheld touchscreen for setup, tuning, and gauges
• Self-learning fuel maps and integrated ignition timing control
• Stealth wiring with all connections exiting below the rear injector cover
• Built-in 1 Bar MAP sensor and Bosch LSU 4.9 wideband O2 sensor
• Transmission control for Pre-2009 GM 4L60E/4L80E and common Ford/GM automatics
• Supports boost, nitrous control, and dry nitrous with multi-stage and progressive options
• Fits many stock air cleaners with machined air entry and locator provisions

Fitment

• Universal 4150 squarebore flange fits most factory intake manifolds
• Compatible with GM LS engines (24x or 58x crank trigger)
• Supports GM TH350/400, 200R4/700R4, C4/C6 transmissions and Pre-2009 4L60E/4L80E

Note: Requires external fuel pressure regulator set to 58.5 PSI (Holley P/N 12-886 or equivalent). Distributor, fuel pump, fuel hose, and mounting hardware are not included. Verify compatibility before ordering.