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Description
Holley 550-910T EFI Terminator X - Gen IV 4.8/5.3/6.0 GM Truck Engines and LS2/LS358x Crank 4x Cam EV1 Injectors USB CAN Tuning Cable Part Number: 550 910T 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
58x Crank - 4x Cam - EV1 Injectors - USB/CAN Tuning CablePart Number: 550-910T
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. These Terminator X kits include a USB/CAN tuning cable instead of the 3.5" Handheld LCD, these kits require the use of the free Terminator X Software for initial setup. The Terminator X Software includes multiple base calibrations to choose from for either naturally aspirated or boosted engines. 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 and Benefits
• Designed for GM LS Engines with 58x Crank, 4x Cam - and EV1 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!
• Includes CAN/USB tuning cable allowing you to configure your ECU and Tuning the engine in real time.
• The compact ECU size allows you to mount it virtually anywhere. Remember, diagnostic LEDS must face up!
• Plug and play compatible with multiple Holley EFI accessories including our gauges, shift lights, various modules, and digital and pro dashes (Holley P/N's 553-106, 553-111, and 553-112)
• Free EFI Tuning Software for complete control of your Terminator X power plant
• Includes: 58x/4x LS Engine Main Harness - EV1 Injector Harness - Terminator X ECU - ECU Main Power Harness - Bosch LSU 4.9 Wideband Oxygen Sensor - Input/Output Harness - and assorted vacuum adapters.
Terminator X ECU's are designed to be mounted with the LED's facing up.
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
4.4 ★★★★★
Based on 13 reviews
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Product Reviews
★★★★★ 5
Durable and Dogs love it
Color: Red, Color: Red
Great for aggressive chewers. I have Large dogs that rip through almost every toy. They love to play tug a war with this but mostly just lay in the yard and chewed on it. Its still holding up strong. It is made od a heavy duty rubber type material. It has no odor. The color is bright red and has not faded as of yet. It appears to be safe since they have yet to chew any places pieces off. We take it camping or on trips so portability is nice. Its definately worth the money. I would recommend.
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Reviewed in the United States on May 9, 2026
★★★★★ 5
Safe good quality toy!!!
Color: Red, Color: Red
Great toy! Good quality, the price! My eight month old puppy loves it. Solid and has some weight to it. Would buy again!
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Reviewed in the United States on June 7, 2026
★★★★★ 4
Hefty but good quality!
Color: Red
It's hefty! I bought this for my 70lb Dutch Sheperd/Malinois mix because she, as the breeds are, is extremely active and loves to play tug of war. I read the reviews and knew the bone was noted to be heavy but bought it anyway. It was a little bulky for her at first and she let it lie for a couple of months but was picking it up today. I will get use out it with her as she continues to grow but definitely not for smaller dogs. It's still a good, sturdy product!
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Reviewed in the United States on January 6, 2026
★★★★★ 5
Have bought a few of these over the last handful of years
Color: Red
Best toy outside of Ghonuts for heavy chewers. Even outlasts the most durable Kongs. I'd say we get about four months before our dog starts really making a dent in it and the size of the pieces he pulls off start to become larger and I should probably replace it after about six months. It's cheap enough that replacing it that often is fine.
*Important note* using squishy toys for heavy chewers is really important. They can break their teeth on hard toys like Nyla bones and things like antlers can break and cut them and damage their digestive system if they swallow the shards. It sucks because my dog loved Nyla bones and would chew off an inch a day, but I couldn't risk his teeth like that.
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Reviewed in the United States on April 5, 2026
★★★★★ 5
Finally - a tug toy my dog hasn’t destroyed!
Color: Red
This completely exceeded my expectations! My dog is roughly a year old, about 110-115lbs and a TOUGH chewer. He loved tugs toys but none of them last more than 10 minutes with him. I decided to try this because of the other reviews and price but wasn’t expecting it to last long. He’s had it almost a week and it’s still completely intact. It’s definitely heavy so it might not be best for smaller dogs but if you have a big dog/heavy chewer definitely give this a shot!
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Reviewed in the United States on May 16, 2026