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Description
Holley Terminator X Engine Management Systems 550-905TERMINATOR X MPFI, LS2 LS3 & LATE TRUCK Take control of your LS engine with Terminator X! Don't settle for a junkyard ECU with a cumbersome tuning interface when you can have complete control of your engine, self learning fuel strategies and the proven, race winning technology of Holley EFI at a budget friendly price! Terminator X features real time fuel learn, high impedance injector drivers, an integrated 1bar MAP sensor, and 4 programmable inputs
TERMINATOR X MPFI, LS2/LS3 & LATE TRUCK
Take control of your LS engine with Terminator X! Don't settle for a junkyard ECU with a cumbersome tuning interface when you can have complete control of your engine, self-learning fuel strategies and the proven, race-winning technology of Holley EFI at a budget-friendly price! Terminator X features real-time fuel learn, high impedance injector drivers, an integrated 1bar MAP sensor, and 4 programmable inputs and outputs. The inputs and outputs are ideal for electric fans, boost control solenoids, progressive nitrous control, and much more. Terminator X comes fully loaded with base maps for common LS engine combinations to get you out of the garage and on the road/track fast. The 3.5" touch screen LCD handheld contains an easy to use calibration wizard as well as tuning and gauge display functions. Also included is Holley EFI's industry-leading, easy to use software suite that allows full laptop access for advanced users. Whether you are building a budget beater or a boosted race car, Terminator X has the features and technology you need at a price that won't break the bank!
Features:
- Designed for GM LS Engines with 58x Crank, 4x Cam - and EV6 Injectors.
- Real-Time fuel map learn, takes the guess work out of tuning your base fuel table.
- High Impedance Injector Drivers will safely power most Stock LS injectors, and Holley EFI Injectors. Injector support chart provided in the instructions (Will not control Low Impedance Injectors)
- All of the new Terminator X systems utilize the Bosch LSU 4.9 wideband to relay AFR information to the ECU for accurate reading and precise tuning control.
- MAP Sensor vacuum hose adapters (1/8th – ¼ and 3/16ths)
- 4 Inputs – 12v, Ground, 5v, and Frequency, for things such as additional pressure sensors, or activation triggers for nitrous activation, or a trans brake
- 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
- 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
- Advanced Tables – 4x 1D Tables, 1x 1D per Gear Table, 4x 2D Tables, 1x 2D per Gear Table, can be used for any custom tables you can dream up, such as Flex Fuel Sensor Offset Table, or a custom fuel or oil pressure safety!adjustable through included 3.5” f
- The included 3.5" Touchscreen Handheld contains a calibration wizard, that allows you to quickly build a base tune for any LS engine. Additionally the handheld provides internal data-logging and a fully customizable gauge display.
- The compact ECU size allows you to mount it virtually anywhere. Remember, diagnostic LEDS must face up!
- Plug and play compatible with more Holley EFI accessories such as; analog style gauges, shift lights, various modules, and coming soon, 12.3" digital dash support!
- Free EFI Tuning Software for complete control of your Terminator X power plant
- Includes: 58x/4x LS Engine Main Harness - EV6 Injector Harness - Terminator X ECU - ECU Main Power Harness - Bosch LSU 4.9 Wideband Oxygen Sensor - Input/Output Harness - and assorted vacuum adapters.
Specs
| Brand | Holley EFI |
|---|---|
| Crank Reluctor | 58x |
| Emission Code | 3 |
| Ignition Type | GM LS 58x |
| Injector Connector | USCAR (EV6) |
| Product Type | Terminator X LS MPFI |
| Terminator LS Options | Fuel, Spark |
| Part Number | 550-905 |
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.8 ★★★★★
Based on 22 reviews
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Product Reviews
★★★★★ 4
The truth
Format: Paperback
It’s a good read but tells how to pray against demon warfare but nowhere does it tell how you( the reader) can be delivered!
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Reviewed in the United States on August 20, 2025
★★★★★ 5
What's the most important thing to know?
Format: Paperback
It's wonderful.
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Reviewed in the United States on March 15, 2026
★★★★★ 5
Gentle on Skin, Great Value
Color: 6pcs
Great quality and easy to use. These dermaplane razors remove peach fuzz and shape eyebrows with precision while being gentle on sensitive skin. My skin feels smoother, makeup applies better, and the 6-pack is a great value. Definitely a great purchase!
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Reviewed in the United States on May 5, 2026
★★★★★ 5
I really like these I would buy again
Color: 6pcs, Color: 6pcs
I’m honestly so impressed with these dermaplane razors! They came in a cute little storage bag, which I love because it keeps everything clean and organized instead of just tossing them in a drawer.
The variety in sizes is also a huge plus—it makes it easy to use around different areas of your face, especially eyebrows and smaller spots where you need more precision. The blades feel gentle on the skin but still get the job done, removing peach fuzz and leaving my face feeling super smooth.
I’ve used a few different brands before, and these are definitely a great value for the price. Perfect for at-home touch-ups without irritation.
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Reviewed in the United States on April 21, 2026
★★★★★ 5
Smooth Skin Made Easy! ✨
Color: 6pcs, Color: 6pcs
These dermaplane razors are a game-changer (per my wife) when it comes to at-home facial care. This pack of six razors works wonders on peach fuzz, eyebrow grooming, and exfoliating your face. The blades are sharp enough to get a clean, close shave but still gentle on the skin, making it great for beginners or anyone with sensitive skin. Plus, the ergonomic handle makes them easy to control, which helps with precision when shaping your brows.
Compared to other dermaplane tools she's tried, these are definitely better quality and last longer before getting dull. Some cheaper ones she's used before start snagging or feel rough after just a couple of uses, but these stay sharp longer and glide smoothly across the skin. One minor downside is that the cap can be a little loose, so be careful when storing them to avoid accidental nicks.
Overall, if you're looking for a convenient way to keep your face fuzz-free and smooth without salon prices, these razors are a great buy. You'll definitely notice the difference in your skin texture and makeup application after using them.
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Reviewed in the United States on October 19, 2024