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Description
Holley Terminator X Engine Management Systems 550-904TERMINATOR X MPFI, 4. 8 6. 0 EARLY 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, 4.8-6.0 EARLY 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:
- For GM LS Engines with 24x crank reluctor and Multec 2 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 Outputs – Ground, PWM - , for accessories such as; fans, boost control, nitrous control, IAC Kit, and More
- 4 Inputs – 12v, Ground, 5v, and Frequency, for things such as additional pressure sensors, or activation triggers for nitrous activation, or a trans brake
- 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: 24x LS Engine Main Harness - Multec 2 Injector Harness - Terminator X ECU - ECU Main Power Harness - Bosch LSU 4.9 Wideband Oxygen Sensor - Input/Output Harness - and assorted vacuum adapters.
Application
- 2003 - 2006 Chevrolet Express
- 2003 - 2006 GMC Savana
- 1999 - 2006 Chevrolet Silverado
- 1999 - 2006 GMC Sierra 1500
- 2000 - 2006 Chevrolet Tahoe
- 2000 - 2006 GMC Yukon
- 2002 - 2007 Chevrolet Avalanche
- 2002 - 2006 GMC Yukon XL 1500
- 2003 - 2005 Chevrolet TrailBlazer EXT
- 2003 - 2004 Isuzu Ascender
- 2003 - 2004 GMC Envoy XL
- 2003 - 2004 Chevrolet SSR
- 2004 Buick Rainier
- 2002 - 2007 Chevrolet Silverado 1500
Specs
| Brand | Holley EFI |
|---|---|
| Crank Reluctor | 24x |
| Emission Code | 3 |
| Ignition Type | GM LS 24x |
| Injector Connector | Multec 2 |
| Product Type | Terminator X LS MPFI |
| Terminator LS Options | Fuel, Spark |
| Part Number | 550-904 |
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
4.0 ★★★★★
Based on 18 reviews
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Product Reviews
★★★★★ 5
Great quality and value!
Flavor Name: Superior Blend, Size: 3.5 Ounce (Pack of 1), Flavor Name: Superior Blend, Size: 3.5 Ounce (Pack of 1)
After my Japan trip last year, I became a Matcha lover. Bought a few different brands, Naoki is the best and is my favorite. Taste fresh, smooth and love the bright green color. I drink Matcha latte everyday. Also whenever my friends come over, I would make one for them to show off my Matcha making skills. They love it as much as I do.
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Reviewed in the United States on March 26, 2026
★★★★★ 4
Good Beginner Matcha
Flavor Name: Superior Blend, Size: 1.75 Ounce (Pack of 1), Flavor Name: Superior Blend, Size: 1.75 Ounce (Pack of 1)
I am a beginner Matcha enthusiast and I love i
making matcha lattes at home (my favorite is Strawberry Matcha lattes). I have repurchased Superior Ceremonial 3× now. I am on my second 3.5 oz bag. I've also tried another well known popular affordable matcha (Jade Leaf) and I immediately decided it is better to splurge accouple more dollars in purchasing Naoki. The texture of the powder is extremely fine. The color is a beautiful dark vibrant green. The flavor is very light with a very low bitterness and a hint of sweetness on its own. It has a very clean taste. However, the flavor does get easily over shadowed by milk and sweetners in a latte. If you want to taste the matcha better you need to add more matcha powder (~4.5 grams). Considering the fact that I am not drinking Matcha traditionally, I do not need a flavor profile that is super complex like what other matcha enthusiasts rave about (often times their recs are super overpriced for its size and/or hard to get). I just need something that will be paired well when used with milk and sweetners. I look for matcha with good quality, affordability, and easy accessibility to repurchase (via Prime adds extra brownie points). Superior Ceremonial checks all the boxes to a first good intro to matcha!
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Reviewed in the United States on February 2, 2026
★★★★★ 5
absolute favorite!
Flavor Name: Superior Blend, Size: 3.5 Ounce (Pack of 1)
I’ve been using Naoki Matcha Superior Ceremonial Blend for about two months now, and I absolutely love it. It has a very smooth taste with no bitterness at all, and it whisks into the most beautiful silky microfoam.
The flavor is mild with a nice subtle umami taste, which makes it really enjoyable to drink every day. My favorite way to make it is as a strawberry matcha latte—it tastes just like something you’d get at a coffee shop.
If you’re looking for a high-quality ceremonial matcha that tastes smooth and not too strong, I highly recommend this one. I will definitely be buying it again!
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Reviewed in the United States on May 15, 2026
★★★★★ 5
Delicious at the right temperature
Flavor Name: Superior Blend, Size: 3.5 Ounce (Pack of 1)
160 degrees Fahrenheit is the perfect temperature to reduce bitterness in this matcha. 170 and 175 produced more bitterness.
It’s smooth, savory, not bitter, mixes easily, and is delicious purely on its own (not in a latte). It’s a great value for drinking alone and probably on the more expensive end if you sweeten or add milk.
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Reviewed in the United States on May 15, 2026
★★★★★ 3
Not bad
Flavor Name: Superior Blend, Size: 1.4 Ounce (Pack of 1)
Great if you like a more subtle flavor, not bitter. If you just add it to milk then it has a slight very brief strong aftertaste, but I like mine a bit stronger. it mixed well it did not clump for me, it was a great vivid color. I will say I prefer a strong, bold matcha taste in my lattes so I do not think I would purchase again but overall it is a great option for beginners, people trying to figure out what they like, or folks who like a smoother, not bitter taste. The tin did come dented unfortunately, not a huge deal but also not great to receive a product that has been somewhat damaged.
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Reviewed in the United States on April 16, 2026