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Ships within 48 hours · Estimated delivery Jul 10 - Jul 15
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Description
Holley Terminator X MAX Engine Management Systems 550-931TERMINATOR X MAX MPFI W DBW 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
TERMINATOR X MAX MPFI W/DBW
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 550-931 also has 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:
- Designed for GM 4.8/5.3/6.0 LS Truck Engines and LS2/LS3 with 58x Crank, 4x Cam and a Drive-By-Wire Throttle Body, 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.
- 4 Outputs – Ground, PWM - , for accessories such as; fans, boost control, nitrous control, IAC Kit, and More
- 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
- Recommended Pedal part number - 10379038
- Includes: 58x/4x LS Engine Main Harness - EV6 Injector Harness - DBW Throttle Body 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 | 58x |
| Emission Code | 3 |
| Ignition Type | GM LS 58x |
| Injector Connector | USCAR (EV6) |
| Product Type | Terminator X Max LS MPFI |
| Terminator LS Options | Fuel, Spark, Drive-by-Wire |
| Part Number | 550-931 |
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
4.8 ★★★★★
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Product Reviews
★★★★★ 5
High Quality - Great Price
Size: Queen, Color: Blue
Great sheets. They are soft, wash up well, fit as stated. The fabric makes it easier to make the bed. I would recommend to everyone.
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Reviewed in the United States on December 27, 2025
★★★★★ 5
Maybe a bit short on sides?
Size: King, Color: Blue Chambray
Really soft, but the sides are short for a king size bed. Plenty of length. So I’ve had to turn it sideways. Maybe it got sewn wrong?
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Reviewed in the United States on December 31, 2025
★★★★★ 4
Wish the sides were longer
Size: King, Color: Blue Chambray
I love jersey knit sheets. They are comfortable in all temperatures. These do not disappoint particularly for the cost. Unfortunately the top king size sheet is too small, with only just barely enough drop, on the sides. Length wise they are fine.
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Reviewed in the United States on February 5, 2026
★★★★★ 5
Best value and quality!!
Size: King, Color: Blue
Best comfy sleep you'll ever get... im h8gh functionally autistic and texture is a severe challenge for me.. but these sheets were the best! Ordering another set.. NOW!
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Reviewed in the United States on May 24, 2026
★★★★★ 1
Very Comfortable but NOT As Expected for Multiple Reasons
Size: Queen, Color: Teal
I purchased my first Briarwood Home Jersey Queen Sheets June 2018 and was very pleased with the quality and how comfortable they are. The 2nd set I recently received (Oct. 2019) is VERY inferior compared to the first set. So inferior I would consider them defective. The fitted sheet is very very small and "barely" fits on my standard queen mattress regardless of which way I turn it. This was not an issue with 1st set. I have to really pull hard in order to get it to fit over my standard queen mattress. Luckily I don't have a pillow top mattress otherwise it probably would not fit at all. Plus, it's so tight the fitted sheet does not tuck under the mattress. Very surprised since the 1st set I have had no issues. Also, the flat sheet is MUCH smaller compared to first set. only about 3" hangs over side of mattress where other flat sheet hangs almost to bottom of box spring. Minor observation; the 1st set had a Briarwood Home tag on outside of pillow cases. The 2nd set does not have that tag. I also want to add that these seem thinner than the first set since I can see mattress cover through them and pillow case cover,,, but the translucent appearance could be because the 2nd set is white and the 1st set was teal. Overall VERY disappointed. I was going to order a grey set but WILL NOT due to these issues. I did email the Briarwood Home customer service today and hope they offer a resolution. NOTE: The customer service phone number goes straight to voicemail and then states the mailbox is full. This is the 2nd time I tried calling with same results so your only option is to send an email. I find that to be suspicious. I will update when I hear back,,, or don't hear back. UPDATE 2-13-2020: NEVER RECEIVED RESPONSE FROM BRIARWOOD. I WILL NEVER ORDER SHEETS FROM BRIARWOOD AGAIN. INSTEAD, SINCE THE 2ND SET OF BRIARWOOD SHEETS BARELY FIT MY STD. QUEEN BED I ORDERED ANOTHER SET OF QUEEN JERSEY COTTON SHEETS FROM: Road Trip America Cozy, T-Shirt Soft 100% Organic Cotton Jersey Knit, GOTS-Certified, Solid Color Bed Sheet Set (White, Queen). They have not arrived but I will provide a review after I receive them.
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Reviewed in the United States on August 21, 2018