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Description
Holley 550-928 EFI Terminator X Max - Gen IV 4.8/5.3/6.0 GM Truck Engines and LS2/LS358x Crank 4x Cam EV6 Injectors Drive By Wire Throttle Body and Transmission Control 3. 5 in. Touchscreen Part Number: 550 928 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
58x Crank - 4x Cam - EV6 Injectors - Drive-By-Wire Throttle Body and Transmission Control - 3.5 in. TouchscreenPart Number: 550-928
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. 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 and Benefits
• 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 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 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, 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 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
• Recommended Pedal part number - 10379038
• Includes: 58x/4x LS Engine Main Harness - EV6 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 - I/O Harness
Not recommended for 4x4 applications with electronic transfer cases. Not compatible with 4L6X transmissions from model year 1995 or before due to year-by-year changes in converter lockup and downshift strategy. ECU is not recommended for marine applications, but can be used on off-road applications as long as you choose a safe location, keep it dry, protect from heat, and ensure proper wiring management.
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
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- 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
4.5 ★★★★★
Based on 12 reviews
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Product Reviews
★★★★★ 2
Way to harsh
I’m not someone that has sensitive skin, like at all. I even exfoliate every week or two with one of those super course gloves that legit beads up your dead skin. When I first came across these Cleanlogic I thought that they were like a washcloth material but in poof form, I actually got them thinking my son would love them. Once I got them and felt them I realized that they were way to course to let my 8 year old use. But since I generally love exfoliating ones like these I figured I would love them.
Unfortunately these are way to harsh even for me. You can barely touch them to your skin without feeling like they are going to leave scratch marks! I even thought maybe they needed to soak in water for a bit and that they were just stiff. Nope. So unfortunately for me these are a pass.
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Reviewed in the United States on November 7, 2021
★★★★★ 5
Sensitivity and gum issues be gone
Flavor Name: Mint, Size: 3.4 Ounce (Pack of 1)
Great toothpaste! I've been incorporating more nano hydroxyapatite into my oral care routine, and I was pleased to find this with a verifiable 10% concentration. It's pricey, but worth it in my opinion. It only takes a tiny amount to do the job, which is actually surprising considering it doesn't foam. I'm prone to canker sores, and this prevents them. The taste is fresh and not too overpowering. It's great if you have sensitivity, and definitely reduces or eliminates it. I had professional whitening done, and zero sensitivity because of this. It's great for preventing stains on your teeth (huge coffee/tea drinker), too! And, if you have gum issues, this will help tremendously. My dentist was very pleased at my appointment this past week. Will continue to use, and recommend to others.
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Reviewed in the United States on April 11, 2026
★★★★★ 5
Holistic Dentist Recommended & We’ve Seen a Big Difference
Flavor Name: Mint, Size: 3.4 Ounce (Pack of 1)
Our holistic dentist recommended Dr. Jen’s fluoride-free toothpaste with 10% nano-hydroxyapatite after my daughter had struggled with quite a few cavities. We wanted something that would help strengthen and support her enamel without fluoride, and this was the product she specifically suggested.
One thing I really like is that it’s a non-rinse formula. After brushing, she just spits and doesn’t rinse, so the nano-hydroxyapatite can stay on the teeth longer to help support enamel. That gives me extra peace of mind knowing it’s continuing to work even after brushing.
The texture is smooth and not gritty, and the flavor is mild enough that she actually uses it without complaining. Since switching, her teeth look clean and healthy, and we feel much better about her cavity prevention routine.
The only downside is the price — it’s definitely very expensive and one of the most expensive toothpastes out there. But for us, given the dentist recommendation and the peace of mind, it’s been worth it.
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Reviewed in the United States on February 19, 2026
★★★★★ 5
Hopefully it strengthens the Tooth Enamel!
Flavor Name: Mint, Size: 3.4 Ounce (Pack of 1)
Excellent Product: I've been using its for a couple months and the flavor is fantastic. Ideally, you don't want to rinse it off your teeth so that the Active HA coats them and stays on for a while (especially at night). I've been recommending it for my patients in my office, and will see if it stops some of the smaller cavities. I'm not a paid Sponsor but love the product
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Reviewed in the United States on May 10, 2026
★★★★★ 5
Does what it claims.
Flavor Name: Mint, Size: 3.4 Ounce (Pack of 1)
Love this toothpaste. Helps with my sensitive teeth and I’ve gotten comments about how white my teeth are. Being fluoride free big plus
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Reviewed in the United States on May 19, 2026