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Ships within 48 hours · Estimated delivery Jul 14 - Jul 19
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Description
Holley Terminator X MAX Engine Management Systems 550-919TERMINATOR X MAX MPFI W TRANS, LS1 W EV6 Take control of your LS engine with Terminator X Max! 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 Max features real time fuel learn, high impedance injector drivers, an integrated 1bar MAP sensor, and 4 programmable
TERMINATOR X MAX MPFI W/TRANS, LS1 W/EV6Take control of your LS engine with Terminator X Max! 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 Max 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. Part number 550-916 also has 4L60E or 4L80E Transmission control. Terminator X Max 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 MAX 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 and 4L60E/4L80E transmissions
- 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 Max 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
- 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
- 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 - 4L60E/4L80E Transmission Control Harness - Terminator X MAX 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 Max LS MPFI |
| Terminator LS Options | Fuel, Spark, Transmission |
| Part Number | 550-919 |
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
4.7 ★★★★★
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Product Reviews
★★★★★ 5
Why Spend More!
Color: Lucky, Size: One Dozen
For older golfers with slower swing speeds like me, these are a very good option. They do have a nice soft feel whether you’re driving, hitting an iron, chipping or putting. Distance is as good as much higher priced golf balls too. I’m not going to spend $50-$60 for a premium ball that doesn’t produce any better results. As a bogey golfer, these are plenty good enough.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 24, 2026
★★★★★ 5
Keep them in your bag!!
Color: White, Size: One Dozen
The Callaway Golf Supersoft Golf Balls have been my go to golf ball for a long time. The quality, durability and cost have always been a top consideration when I’ve purchased them. Unless something changes in the future, they will always be one of my go to golf balls.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 28, 2026
★★★★★ 5
Great balls
Color: Blue Splatter, Size: One Dozen
Great balls ,just got my callaway super soft golf balls I hit my balls all day and still look new the balls are tuff. Got blue paint spatter cool looking balls even the girls like my new balls,just dont won’t to lose one,,if you like good balls look no more get thies ball and put them in your pocket.all your friends will want your balls too…
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Reviewed in the United States on April 16, 2026
★★★★★ 5
Comfortable Fit, Great for Adding Intensity to Workouts
Size: 20lb, Color: Black, Size: 20lb, Color: Black
I’ve been using the 20lb weighted vest for my workouts and have been really happy with it so far. The fit is comfortable and secure without moving around too much during walks or exercises. It feels well-balanced and not awkward on the shoulders, which makes a big difference during longer workouts.
I mainly use it for walking and bodyweight exercises, and it definitely adds intensity and helps make workouts feel more effective. The straps fit nicely and it feels sturdy overall. If you’re looking for a weighted vest to help increase resistance and improve workouts, I would recommend this one.
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Reviewed in the United States on May 18, 2026
★★★★★ 5
Worth Every Penny for Workouts & Daily Walks
Size: 12lb, Color: Black, Size: 12lb, Color: Black
I’ve been using this weighted vest for my workouts and even during daily walks, and it has made such a difference. The weight feels evenly distributed, so it’s comfortable to wear without putting too much strain on my shoulders or back.
I love that it adds an extra challenge to simple workouts without needing extra equipment. The straps are adjustable, which helped me get a secure fit, and the material feels durable and well made.
As a busy mom always trying to squeeze in movement wherever I can, this vest helps me make even short workouts feel more effective. Definitely a great addition to my fitness routine!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 22, 2026
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