
Standard Sniper EFI Features!
- Self Learning
Means you don't have to be a computer/tuning wiz to have EFI! - Integrated ECU
Eliminates the need of mounting an external box, saving you time and money. - Timing Control
Provides optimal idle stability, and throttle response, and maximizes the output potential of your powerplant. - Fan Control
Eliminates the need for an external fan controller, simply wire a relay to power your fan, and let the ECU trigger the relay at the desired coolant temp. - Boost Compatible
Advanced boost control allows you to huff as much pressure into the engine as you require, while allowing you to safely pull ignition timing, and add fuel. - Nitrous Control
Built in Dry or Wet Progressive or Non-Progressive nitrous control allows you to bottle fed your engine without needing to add an external controller. - 3.5 in. LCD Display
Serves as a tuner and a digital gauge display, all at the palm of your hand. - Laptop Tuneable (Free)
For the advanced users, the Sniper EFI tuning software gives you complete control of your engine's performance.

Sniper EFI Quick Reference Guide
Sniper EFI | Horsepower (Naturally Aspirated | Horsepower (Naturally Aspirated | Injectors (100LB/HR) | Boost Control | Barrels | CFM | Fuel Pressure Regulator | Available as Master Kit |
---|---|---|---|---|---|---|---|---|
4150 Sniper EFI | 650 | 575 | 4 | No | 4 | 800 @ 1.5" Hg | Included | Yes |
Super Sniper 650 | 650 | 575 | 4 | Yes | 4 | 800 @ 1.5" Hg | Included | No |
Super Sniper 1250 | 650 | 1250 | 8 | Yes | 4 | 800 @ 1.5" Hg | Included | No |
Sniper 2x4 4150 | 1250 | 1250 | 8 | No | 2x4 | 1600 @ 1.5" Hg | Not Included | No |
Super Sniper 2x4 4150 | 1250 | 1250 | 8 | Yes | 2x4 | 1600 @ 1.5" Hg | Not Included | No |
Sniper XFlow | 800 | 690 | 4x120 | Yes | 4 | 900 @ 1.5" Hg | Not Included | No |
Sniper XFlow 1375 | 800 | 1375 | 8x120 | Yes | 4 | 900 @ 1.5" Hg | Not Included | No |
Sniper EFI 2300 | 350 | 285 | 2 | No | 2 | 580 @ 3" Hg | Included | Yes |
Super Sniper 2300 | 350 | 650 | 4 | Yes | 2 | 580 @ 3" Hg | Included | No |
Sniper EFI BBD | 350 | 285 | 2 | No | 2 | 370 @ 3" Hg | Included | Yes |
Sniper EFI Small Bore 2GC | 350 | 285 | 2 | No | 2 | 370 @ 3" Hg | Included | Yes |
Sniper EFI Quadrajet | 500 | 575 | 4 | No | 4 | 715 @ 1.5" Hg | Not Included | Yes |
Sniper EFI Stealth 4500 | 1500 | 1250 | 8 | Yes | 4 | 1440 @ 1.5" Hg | Not Included | No |

Standalone Engine Management, at a budget price. Plug and Play with most domestic V8 Engines!
Terminator X and X Max Features and Benefits

- Plug and play Domestic V8 engine control
- Drive-by Wire Throttle Body Control (Terminator X Max Only)
- Electronic Transmission Control GM 4L60-80 - Ford 4R70W - Chrysler 46RE (Terminator X Max Only)
- Genuine Bosch LSU 4.9 Wideband Control (Will not work with LSU 4.2 Oxygen Sensors)
- On-Board Diagnostic LEDS for: ECU Power – Engine Run – Wideband Status – TPS Calibration – Crank Signal – Cam Signal. Allow you to identify any Critical engine issues at a glance
- Built in 1bar MAP Sensor, vacuum hose adapters included (1/8th – ¼ and 3/16ths) - or for Boosted applications, you can disable the internal MAP sensor, and utilize an external MAP Sensor, the harness comes with the connector terminated, making the installation a snap.
- 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
- Boost Control – Boost vs Time, Boost vs Gear, Boost vs RPM, Boost vs Speed, Boost Safeties
- Nitrous Control – Single Channel of Wet or Dry, Progressive or Non-Progressive, Rich/Lean Safeties, and target Closed Loop AFR
- Advanced Tables – 4x 1D Tables, 1x 1D per Gear Table, 4x 2D Tables, 1x 2D per Gear Table
- Integrated Datalogging to the 3.5” Handheld SD Card
- Free EFI Tuning Software for complete control of your Terminator X power plant

Holley Electronic Fuel Injection Comparision Chart
Hardware | HP | TERMINATOR X | DOMINATOR | TERMINATOR X MAX | SNIPER TBI |
---|---|---|---|---|---|
Connectors | 2 | 2 | 6 | 4 | - |
Injector Drivers | 8 | 8 | 12 | 8 | 8 |
Low Impedance Injector Drivers | YES | NO | YES | NO | NO |
Communication via USB Port | YES | NO | YES | NO | NO |
Communication via CAN adapter | NO | YES | NO | YES | YES |
Diagnostic LEDs | NO | YES | NO | YES | NO |
Knock Sensors | 2 | 2 | 2 | 2 | - |
Enclosure | Aluminum | Composite | Aluminum | Composite | - |
Potted | YES | NO | YES | NO | YES |
Data Logging | HP | TERMINATOR X | DOMINATOR | TERMINATOR X MAX | SNIPER TBI |
Internal & External | External Only | Internal & External | External Only | External Only | |
MAP Sensor | HP | TERMINATOR X | DOMINATOR | TERMINATOR X MAX | SNIPER TBI |
External Only | Internal 1 BAR, or External | External Only | Internal 1 BAR, or External | Internal 2.5 BAR | |
Wideband Sensors | HP | TERMINATOR X | DOMINATOR | TERMINATOR X MAX | SNIPER TBI |
1 | 1 | 2 | 1 | 1 | |
Bosch 4.2 | YES | NO | YES | NO | NO |
NTK | YES | NO | YES | NO | NO |
Bosch 4.9 | NO | YES | NO | YES | YES |
Total Inputs (+12v, Gnd, 5v, Freq) | HP | TERMINATOR X | DOMINATOR | TERMINATOR X MAX | SNIPER TBI |
4 | 4 | 50 | 4 | Varies | |
+12v | Yes | Yes | Yes | Yes | No |
Ground | Yes | Yes | Yes | Yes | 2 |
+5v Sensor | Yes | Yes | Yes | Yes | 3* - SS Only |
Frequency | Yes | Yes | Yes | Yes | NO |
Thermistor | Yes | NO | Yes | NO | NO |
+20v | Yes | NO | Yes | NO | NO |
Digital Speed | NO | NO | Yes | NO | NO |
Customizable Software Inputs | 80 | 20 | 80 | 20 | NO |
A/C Shutdown | Yes | Yes | Yes | Yes | NO |
Total Outputs (Gnd, PWM-) | HP | TERMINATOR X | DOMINATOR | TERMINATOR X MAX | SNIPER TBI |
4 | 4 | 36 | 4 | Varies | |
+12v | Yes | NO | Yes | NO | No |
PWM+ | Yes | NO | Yes | NO | No |
Ground | Yes | Yes | Yes | Yes | YES |
PWM- | Yes | Yes | Yes | Yes | YES |
Customizable Software Outputs | 62 | 20 | 62 | 20 | NO |
Dual Fans | Yes | Yes | Yes | Yes | YES |
Secondary Fuel Pump | Yes | Yes | Yes | Yes | YES |
IAC Kick | Yes | Yes | Yes | Yes | YES |
Non-Electronic Trans TCC Control | Yes | Yes | Yes | Yes | NO |
Load Sensing | HP | TERMINATOR X | DOMINATOR | TERMINATOR X MAX | SNIPER TBI |
VE | YES | YES | YES | YES | YES |
Speed Density | YES | YES | YES | YES | YES |
Alpha-N | YES | YES | YES | YES | NO |
Combo | YES | YES | YES | YES | NO |
Boost Control | HP | TERMINATOR X | DOMINATOR | TERMINATOR X MAX | SNIPER TBI |
MAP and Dome Control | YES | NO | YES | NO | NO |
Dome Control | YES | YES | YES | YES | YES |
Boost vs Time | YES | YES | YES | YES | YES |
Boost vs RPM | YES | YES | YES | YES | YES |
Boost vs Speed | YES | YES | YES | YES | NO |
Boost vs Gear | YES | YES | YES | YES | NO |
Boost Builder | YES | NO | YES | NO | NO |
Boost Safeties | YES | YES | YES | YES | YES |
Nitrous Stages | HP | TERMINATOR X | DOMINATOR | TERMINATOR X MAX | SNIPER TBI |
Wet Non-Progressive | 8 | 1 | 8 | 1 | 1 |
Wet Progressive | 8 | 1 | 8 | 1 | 1 |
Dry Non Progressive | 8 | 1 | 8 | 1 | 1 |
Dry Progressive | 8 | 1 | 8 | 1 | 1 |
GPOs | 8 | 1 | 8 | 1 | NO |
Rich/Lean Safeties | YES | YES | YES | YES | YES |
Closed Loop to New Target | YES | YES | YES | YES | YES |
Advanced Input Strategies | YES | NO | YES | NO | NO |
Advanced Tables | HP | TERMINATOR X | DOMINATOR | TERMINATOR X MAX | SNIPER TBI |
1D | 8 | 4 | 8 | 4 | 4 |
1D Per Gear | 8 | 1 | 8 | 1 | NO |
2D | 8 | 4 | 8 | 4 | 2 |
2D Per Gear | 8 | 1 | 8 | 1 | NO |
Traction Control | HP | TERMINATOR X | DOMINATOR | TERMINATOR X MAX | SNIPER TBI |
YES | NO | YES | NO | NO | |
Water/Meth | HP | TERMINATOR X | DOMINATOR | TERMINATOR X MAX | SNIPER TBI |
YES | NO | YES | NO | NO | |
Staging Assist | HP | TERMINATOR X | DOMINATOR | TERMINATOR X MAX | SNIPER TBI |
YES | YES | YES | YES | NO | |
Drive By Wire | HP | TERMINATOR X | DOMINATOR | TERMINATOR X MAX | SNIPER TBI |
Single Throttle Body | NO | NO | YES | YES | NO |
Dual Throttle Body | NO | NO | YES | NO | NO |
Transmission Control | HP | TERMINATOR X | DOMINATOR | TERMINATOR X MAX | SNIPER TBI |
GM 4L60/4L70/4L80 | NO | NO | YES | YES | NO |
Ford AODE/4R70W | NO | NO | YES | YES | NO |
Accessories | HP | TERMINATOR X | DOMINATOR | TERMINATOR X MAX | SNIPER TBI |
7" Digital Dash | YES | YES | YES | YES | YES |
Pro-Dash | YES | YES | YES | YES | YES |
CAN Modules (VVT, etc) | YES | YES | YES | YES | NO |
Analog Gauges | YES | YES | YES | YES | YES |
Tech & Support Documents
Browse our technical documentation and downloads for information on Holley EFI.
Tech Videos
Watch out instructional videos on Holley EFI.
Frequently Asked Questions
Be sure and visit our frequently asked questions section for quick answers.
Update Holley EFI Software
Learn how to download and update your Holley EFI software.
Certified Holley EFI Dealers
Do you need a custom kit built for your application? Do you need a system installed and tuned? Click here to find the Certified Holley EFI dealer in your area! (All Certified EFI Dealers are factory trained.)
About Holley Fuel Injection
Holley is quickly becoming The New Standard In EFI! Holley’s HP ECU is standard equipment on the 2013-2016 Chevrolet COPO Camaro and Holley’s EFI throttle body powers every NASCAR Sprint Cup Series™ team. As of 2016 Holley EFI is also used to control every NHRA Pro Stock car that goes down the strip! Top racers are making the switch to Holley EFI every day. Racers like Tom Bailey who set three new records and took the overall event win on the 2013 Hot Rod Magazine Drag Week and John Scali who used it to win the 2013 JEGS All Star race. But that’s not all. The world’s best street machine builders and tuners are making the switch to Holley EFI. Builders like Dave Lane who used Holley EFI to power the 2013 Goodguys Hot Rod of the Year and tuners like Steve Morris who use it to build some of the baddest forced induction beasts on the planet. It’s the easiest, most refined, feature-rich system that money can buy. But, don’t take our word for it, see what the best are saying about Holley EFI!
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