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Description
Holley Terminator X Engine Management Systems 550-903TERMINATOR X MPFI, LS1 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
TERMINATOR X MPFI, LS1
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 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.
- 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 - EV1 Injector Harness - Terminator X ECU - ECU Main Power Harness - Bosch LSU 4.9 Wideband Oxygen Sensor - Input/Output Harness - and assorted vacuum adapters.
Application
- 1998 - 2002 Chevrolet Camaro
- 1997 - 2004 Chevrolet Corvette
- 1998 - 2002 Pontiac Firebird
Specs
| Brand | Holley EFI |
|---|---|
| Crank Reluctor | 24x |
| Emission Code | 3 |
| Ignition Type | GM LS 24x |
| Injector Connector | Jetronic / Minitimer (Bosch) |
| Product Type | Terminator X LS MPFI |
| Terminator LS Options | Fuel, Spark |
| Part Number | 550-903 |
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 11 reviews
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Product Reviews
★★★★★ 4
Great fit, simple style, and comfortable for all-day wear
Style: 7" Swim Trunk, Color: Aqua Blue, Size: Small
These swim trunks are a solid find—comfortable, well-made, and true to size. The 7-inch length is just right: not too long, not too short. They dry fairly quickly and have a mesh lining that’s supportive without being annoying.
The style is simple and classic, and they’ve held up well through swimming, beach trips, and even some light hiking. Great value for the price.
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Reviewed in the United States on May 13, 2025
★★★★★ 5
Great swim wear
Style: 7" Swim Trunk, Color: Black, Size: Large
Great fit. Size was perfect
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Reviewed in the United States on June 11, 2026
★★★★★ 5
Great Quality for the Price
Style: 7" Swim Trunk, Color: Navy Hibiscus Flower, Size: X-Large
Great swim trunks for the price. Look nice. Great fit. Appear to be standing up to regular pool use.
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Reviewed in the United States on June 1, 2026
★★★★★ 5
Great
Style: 7" Swim Trunk, Color: Black, Size: Medium
Lightweight and breathable.
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Reviewed in the United States on June 9, 2026
★★★★★ 3
Not quite as good as top name brands but pretty decent so far for the money
Style: 7" Swim Trunk, Color: Black, Size: Large
I compare these to the Columbia version with similar design.
I ordered the large, which is my Columbia size. I note that the Amazon version was slightly tighter in the waist and the lining was significantly tighter in the legs. The elastic bands are both well structured and not flimsy.
I live in Florida and I wear these swim trunks as my everyday outdoor shorts, whether working in the yard, biking, walking, or whatever. I note that when I tried to wear these in my exercise classes, the legs tend to stick and not slide up the legs when I squat, which is not a problem with the Columbia shorts. Lest you think it unfair to compare these two brands, Columbia puts their shorts on sale a couple of times a year for about the same price. Of course, you have to pay attention regularly to their website and it doesn't help if you need shorts now.
I will continue to use these shorts for outdoor work and activities and they seem to be holding up fine for now. Next time I will probably get the XL for comfort if Columbia doesn't have a big sale (unless I can manage to lose a little visceral fat I have collected the last few years!).
One other positive and one negative. I like that the black shorts have a black tie string, but the blue pants have a white string which shows dirt and looks a bit cheaper than if the string was blue. White is fine for swim trunks, but when they are used as all purpose volley shorts it doesn't show well with white string.
I saw some complaints in the comments saying these shorts were not quick drying. I note they are every bit as fast drying as my Columbia and Nike shorts which are advertised as quick drying. As you might imagine a few hours working in the Florida sun I can sweat a ton so I can certainly judge drying speed.
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Reviewed in the United States on September 2, 2025