$188 Off

Holley 550-1021 Terminator X Stealth EFI 4150 24X LS, Black

$188 Off

#4255501021

Holley 550-1021 Terminator X Stealth EFI 4150 24X LS, Black

Terminator X Stealth 4150 Kits for 24x LS engines
Supports up to 650HP with Four 100lb./hr. Injectors
Simple Calibration Wizard (answer a few questions about your engine and it creates the base map, then starts tuning on its own!) - NO laptop required!

Finish:

Black

$2,399.95

Factory Shipped

$2,587.95

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Product Summary

4-Barrel Square Bore Carburetor Flange Type

Terminator X Stealth 4150 Kits for 24x LS engines
Supports up to 650HP with Four 100lb./hr. Injectors
Simple Calibration Wizard (answer a few questions about your engine and it creates the base map, then starts tuning on its own!) - NO laptop required!
Integrated ignition timing control "Plug and play with factory LS coil sub harness and OEM LS coils" no external boxes/modules needed to run Coil Near Plug
All of the wiring exits below the fuel injector bowls, for a completely stealth installation

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Key Specs

Injection Style	Throttle Body
Injector Size	100 lb/hr @ 58.5 PSI
Max Horsepower Rating	650
ECM Included	Yes
Throttle Body Style	Throttle Body Injection (TBI)

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Holley 550-1021 Details

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! Did we mention that the Stealth 4150 also includes transmission kick down provisions for GM TH350/400, 200R4/700R4 and Ford C4/C6 applications? Terminator X Max kits provide plug and play Transmission control for GM 4L60 and 4L80 Transmissions.

Features:

Terminator X Stealth 4150 Kits for either 24x or 58x LS engines
Supports up to 650HP with Four 100lb./hr. Injectors
Terminator X Max kits provide plug and play Transmission control for GM Transmissions
Internal 1bar MAP sensor, built into the Terminator X ECU.
All of the wiring exits below the fuel injector bowls, for a completely stealth installation
Air entry machined to fit most stock style air cleaners with air cleaner locator provisions
External fuel pressure regulator required, set to a base pressure of 58.5 PSI, such as 12-886
Integrated ignition timing control "Plug and play with factory LS coil sub harness and OEM LS coils" no external boxes/modules needed to run Coil Near Plug
High Resolution Full Color Touchscreen for Initial Setup, Tuning, and Gauge Displays
Simple Calibration Wizard (answer a few questions about your engine and it creates the base map, then starts tuning on its own!) - NO laptop required!
Self-tuning ECU means you don't have to be a computer/tuning wiz to have EFI!
4 Inputs - 12v, Ground, 5v, and Frequency, for things such as additional pressure sensors, or activation triggers for nitrous activation, or a trans brake (Fuel and Oil Pressure Inputs are pre-terminated)
4 Outputs - Ground, PWM - , for accessories such as; fans, boost control, nitrous control, IAC Kit, and More
The included Genuine Bosch LSU 4.9 Wideband Oxygen Sensor provides real-time Fuel Map Learn!
OEM Style TPS/IAC, for years of dependable service
Available in 3 finishes: Shiny, Black and Gold
Compatible with Holley EFI digital dashes, gauges and fuel system accessories

Charts

Quick Start Guide (PDF)

Parts Guide (PDF)

Guides & Documents

Choosing an Electronic Fuel Injection Retrofit for Your Street Rod or Muscle Car

Fuel Injection Systems Technical Information (4255501021)

Fuel Injection Systems Installation Instructions (4255501021)

CARB Warning

For race/ off road use or for use on pre-1966 vehicles.

Emissions warning: this part only legal for sale or use in California for racing (competition) vehicles which may never be used, registered, or licensed for use upon a public highway, or if installed in vehicles model-year 1965 or older; motorcycles model-year 1977 or older; or off-highway recreational vehicles (such as off-road motorcycles and all-terrain vehicles) model-year 1996 and older. Any other use renders the vehicle tampered and not legal for use on California public highways (any public street or roadway, public dirt road, public park, or publicly maintained right of way open to the use of the public for vehicular travel). Violations subject to $37,500 penalty per violation per vehicle, revocation of registration, loss of use on California public right of ways, and proof of correction for tampering. There are similar restrictions and penalties under federal law and the laws of all other states with penalties under federal law of up to approximately $45,268 per tampered vehicle and/or engine.

CA WARNING:

Can expose you to lead, a carcinogen and reproductive toxicant. See www.P65Warnings.ca.gov

CARB warning

Holley 550-1021 Specifications

KEY SPECS
MFG. Part #	550-1021
Brand	Holley
Injection Style	Throttle Body
Injector Size	100 lb/hr @ 58.5 PSI
Max Horsepower Rating	650
ECM Included	Yes
Throttle Body Style	Throttle Body Injection (TBI)

GENERAL
Carburetor Flange Type	4-Barrel Square Bore
User Tunable	Yes
Self Tuning	Yes
Injectors Included	Yes
Intake Manifold Included	No
Metering Style	Speed density
EGR	No
Throttle Body Included	Yes
Throttle Body Material	Cast Aluminum
Throttle Body Finish	Powder Coated
Throttle Body Flange Type	4-Barrel Square Bore
Venturi Quantity	4
Fuel Pump Included	No
Fuel Rails Included	No
Calibration Module Included	Yes
Wiring Harness Included	Yes
Fuel Pressure Regulator Included	No
Distributor Included	No
MAP Sensor Included	Yes
IAC Motor Included	Yes
IAT Sensor Included	Yes
TPS Sensor Included	Yes
Emission Code	3
Use with Power Adder	Yes
Throttle Body Barrels	4-Barrel
Notes	Designed for use with 24x crank reluctor
GTIN Code	090127107607
Sold in Quantity	Kit

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Fitment

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2007-2014 GMC Savana 1500

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GM LC9
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2007 GMC Sierra 1500 Classic

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GM L59
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2005-2006 GMC Sierra 1500 HD

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2007 GMC Sierra 1500 HD Classic

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2008-2009 Hummer H2

6.2 Chevy LS V8

2008-2009 Hummer H3

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2009 Pontiac G8

GM LS3

2004 Pontiac GTO

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