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Description
Holley Terminator X Engine Management Systems 550-909TERMINATOR X MPFI, LS1 W EV6 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.
TERMINATOR X MPFI, LS1 W/ EV6
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 LS1/LS6 engines with 24x crank reluctor - with 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.
- On-Board 1bar MAP sensor, is perfect for N/A or Nitrous engine combos. If your combination requires a 2+Bar, we recommend GM 12592525, and our adapter part number 558-416.
- 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
- 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, 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!
- 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
- 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 - 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 | 24x |
| Emission Code | 3 |
| Ignition Type | GM LS 24x |
| Injector Connector | USCAR (EV6) |
| Product Type | Terminator X LS MPFI |
| Terminator LS Options | Fuel, Spark |
| Part Number | 550-909 |
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
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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 6 reviews
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Product Reviews
★★★★★ 4
An Unforgettable Fantasy Read
Format: Paperback
⭐️3.75/5 stars ⭐️
I can’t, in good faith, talk about this book without mentioning the end. If you are a reader who despises cliffhangers, you might want to add this to your TBR (and you’re going to want to read it) until the sequel is announced, because I am STILL reeling over that ending. This cliffhanger is the cliff that keeps on giving. It’s going to stay with me until the day I get to read Book 2.
Why are you going to want to read The Death-Made Prince anyway? First and foremost is the world that Lisette Marshall has created with such a unique and refreshing magic system! I was hooked from the first mention of runes and necromancy. Linguistics is a subject that has always fascinated me, both in reality and in fantasy. Seeing Thraga’s runic witchcraft described as a formulaic language made both my mathematician and reader hearts throb with anticipation. Moreover, I loved Marshall’s take on necromancy - I didn’t realize how literal the “death-made” title for Durlain would be! In The Death-Made Prince, Marshall really does combine a variety of magical elements to create a fantasy world that is hard to leave.
But what also makes The Death-Made Prince hard to ignore are the characters. Thraga and Durlain both have their tragic backstories, but it’s what lies beyond their backstories that truly make them stand out. Thraga is a runewitch with OCD and anxiety, and I just have to say that the representation is ON POINT. On the other hand, Durlain is a loveable black cat MMC who tries so hard to be an idiot (and does succeed). While their enemies-to-lovers relationship is a slow, slow, SLOW burn, it makes it all worth it in the “end.” The banter between them is top-notch and had me hooked and invested throughout.
There were times when their banter was the only thing that kept me reading. The first 50% was slow and I had some trouble staying invested. BUT, I will encourage any reader who looks at my review to STICK WITH IT. The last 20-30% of the book made it oh so worth it. It really picks up once Durlain and Thraga arrive at the Dawn House (iykyk), featuring secrets, lies, and espionage. Oh, and of course the sexual tension. From then on, the plot moved quickly, and I couldn’t put my Kindle down. And then, there was the cliffhanger. But you already knew that.
All in all, The Death-Made Prince introduced a fantasy world that I am loath to leave (even if for a little bit). While the beginning was slow and seemed to drag on, the end was amazing and I do not, and never will, regret reading it. Catch me again when Book 2 is announced…
Thank you to Lisette Marshall and the team at Behind the Pages for letting me read an early copy of The Death-Made Prince! I’m honored to give my honest thoughts on this book and support its release.
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Reviewed in the United States on October 19, 2025
★★★★★ 5
amazing characters
Format: Kindle
These characters were fascinating. They were very damaged but also strong survivors. There was a sarcastic banter between them which I loved. The female lead grew from seeing herself as small but by the end she recognized her many strengths-which she will need to use to escape after a betrayal by the make lead. Best book that I have read in long time.
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Reviewed in the United States on May 26, 2026
★★★★★ 3
thorn of mine and in my side
Format: Kindle
This book really was a thorn in my side because I was spite reading until 60% though simply so I didn’t have to DNF it. Look. I read 2-3 books a week and it took me a week and a half to trudge through this. I don’t know why everyone is freaking out about how good it is because it’s not original, it’s boring, is so confusing, and literally put me to sleep more times than I can count. This is a 2.5⭐️ book rounded up because once I made it to 60% there was enough going on that I could follow it and my interest peaked enough to not DNF. I fear for the next book because this one needs work. I still don’t know who is who or what kingdom they belong to. Truly, this was not set up or executed well. I did however, truly love when he started calling her “thorn of mine”. I thought that was toxic cuteness at its finest. But wow, what a mess.
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Reviewed in the United States on May 8, 2026
★★★★★ 4
enjoyable read
Format: Kindle
I read a ton of romantasy books. This was one of the better ones I read in the past year. The plot is interesting and not repetitive. The slow burn is satisfying. I like that the heroine finds her voice and power along the way
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Reviewed in the United States on March 17, 2026
★★★★★ 5
Could not put this book down!
Format: Paperback
Binge read quality!! Finished in 2 days I was in a dilemma with this book. I couldn't wait to finish because it was so good, and yet I didn't want it to end, because it was so good. Staying up til 2:30am is the highest complement I can give to a book. Current day with Gothic feel. The story pulls you in immediately, and there is never a part where it feels dull, or that you need to skip through. Mysterious with plot twists, especially the end. I love how there were flashbacks from the past intertwined with present day. Gave a great backstory that only came together at the very end. Spicy for sure, and fit in perfectly with story. Great character development so that you could empathize with both of the main characters.. Lucian and Isa. Check Trigger warnings first!
Highly recommend this book
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Reviewed in the United States on March 10, 2026
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