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Description
Terminator X Max 58x/4x EV1 LS MPFI & DBW Throttle & Trans w/o Handheld 550-935TOverview: 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 inputs and outputs. The inputs
Overview:
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 inputs and outputs. The inputs and outputs are ideal for electric fans, boost control solenoids, progressive nitrous control, and much more. Part number 550-928 also has 4L60E or 4L80E Transmission control and Drive-By Wire Throttle Body 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. 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 MAX has the features and technology you need at a price that won't break the bank!
Features:
- Designed for GM LS 4.8/5.3/6.0 LS Truck Engines and LS2/LS3 with 58x Crank, 4x Cam and 4L60E/4L80E transmissions, Drive-by wire throttle body control, 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 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
- 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 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
- Recommended Pedal part number - 10379038
- Includes: 58x/4x LS Engine Main Harness - EV1 Injector Harness - DBW Throttle Body 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 assor
Application:
| Year | Make | Model | Submodel | Engine Size |
|---|---|---|---|---|
| Universal |
Specs:
| Brand | Holley EFI |
|---|---|
| Crank Reluctor | 58x |
| Emission Code | 3 |
| Ignition Type | GM LS 58x |
| Injector Connector | Jetronic / Minitimer (Bosch) |
| Product Type | Terminator X Max LS MPFI |
| Terminator LS Options | Fuel, Spark, Drive-by-Wire, Transmission |
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
4.6 ★★★★★
Based on 27 reviews
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Product Reviews
★★★★★ 5
Sharp, Comfortable, and Wedding Ready Without Breaking the Bank
My best friend got married last year and her oldest son was unable to attend because he was deployed overseas. When he called me to say he was coming home six months early for a stateside assignment, we secretly planned a surprise vow renewal. She originally had a lavender color theme for her wedding, this suit looked incredible and matched up perfectly.
For the price, this set honestly surprised me. You get the jacket, vest, tie and pants, and it does not look cheap. The buttons are sewn on securely, the seams are straight, and the black trim on the lapel gives it that polished vibe. The fabric is a polyester blend, but it has a nice structure to it and holds its shape well in photos.
Fit was spot on according to the size chart. It has a modern slim look without being uncomfortably tight. He wore it all day for the ceremony, pictures, and dinner and said it was comfortable the entire time. No constant adjusting, no pulling at the shoulders, no fighting the pants waistband.
One small downside is that it does recommend dry clean only, which is expected for a suit, but still something to keep in mind if you were hoping for easy at home care. Also, because it is a slim cut, if someone is between sizes or prefers a looser fit, they may want to size up.
For a wedding, vow renewal, formal event, or even prom, this suit delivers. It photographs beautifully and looks far more expensive than the price tag suggests. For a special moment like this, it was absolutely perfect.
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Reviewed in the United States on February 18, 2026
★★★★★ 5
Surprisingly Versatile Suit Set That Works Beyond Formal Wear
Color: Black, Size: Large
I got this for my wife and she absolutely loves it. She originally wanted it to mix and match into her outfits rather than wear it strictly as a full suit, and it worked out perfectly. The slim fit pieces look sharp and modern, and each item can easily be styled separately with other wardrobe staples.
The jacket is well tailored with clean lines, and the black trim on the notch lapel adds a polished touch that elevates even casual looks. She pairs the jacket with jeans or dresses it up with tailored pants. The vest is also a standout piece and looks great layered over blouses or fitted tops. The pants fit well and have a flattering cut that works for both formal and creative styling.
The fabric feels good quality for the price and the overall construction looks well made. This suit works great for weddings and events, but it is also a fun option for fashion forward styling if you like blending menswear inspired pieces into everyday outfits.
Pros:
Clean, modern slim fit design
Jacket, vest, and pants can be styled separately
Polished details with the black trim lapel
Good quality fabric for the price
Works for weddings and creative everyday outfits
Suggestions for improvement:
Offer individual pieces for separate purchase
Include more detailed sizing guidance for alternative fits
Add more color options for mix and match styling
Overall, this suit exceeded expectations and turned out to be a very versatile addition to her wardrobe. Great choice if you want something formal that can also be styled in creative ways.
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Reviewed in the United States on January 29, 2026
★★★★★ 5
"He Cleaned Up So Good I Almost Didn't Recognize Him"
Color: Light Gray, Size: Medium, Color: Light Gray, Size: Medium
Got this three-piece suit for my grandson's school event and LISTEN. This boy walked out looking like he had a business meeting and a reservation at a nice restaurant. The light gray with black trim is sharp, slim fit actually fits without looking too tight, and the vest pulls the whole thing together. He felt like a million bucks and honestly looked like it too. For the price, the quality is impressive, good stitching, decent fabric weight. Only wore it once so far but it held up beautifully. Grandma was PROUD.
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Reviewed in the United States on March 1, 2026
★★★★★ 4
Looks fine at a glance but definitely budget
Color: Ivory, Size: Large
I picked this up in the ivory color and the overall design leans very old school, especially with the oversized front buttons. They look nice from a distance, but up close they feel a bit cheap. The pants are one of the better parts, with a comfortable fit and an elastic waistband, and the included tie is a nice touch. Fit seems generally accurate, though having a size chart would have helped. The material is where the cost really shows, with a coarse polyester exterior and a smoother inner lining that helps with comfort. It gets the job done if you need something affordable in a pinch, just don’t expect it to feel or look high end up close.
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Reviewed in the United States on March 19, 2026
★★★★★ 5
Great looking suit
This suit is very good looking. To me, it is hard to find a suit in a cream color like this, that actually looks good. This one pulled off the trick for me!
The jacket is well made and if you look at the posted photos you will see that the hankie pocket is slightly slanted. That makes this suit a bit unique among others. It even comes with the Red Tie included!
It is well made, great looking, fits right and feels great.
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Reviewed in the United States on April 19, 2026
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