This auction is for a BRAND NEW Take control of your engine with the self-learning fuel strategies and race-proven technology of Holley EFI—all at an affordable price! The Term X Max offers real-time fuel learning, high-impedance injector drivers, an integrated 1-bar MAP sensor, and 4 programmable inputs/outputs that can be used for electric fans, boost control, progressive nitrous, and more. Part number 550-917 also includes 4L60E/4L80E transmission control.

Base maps for common LS engine combos, the Term X Max gets you up and running quickly, whether on the street or track. These kits come with a USB/CAN cable (instead of the 3.5" handheld) and use the free Term X software for setup, which has access to multiple base calibrations for both naturally aspirated and boosted builds. Plus, Holley EFI’s powerful yet user-friendly software suite offers full laptop access for advanced adjustments.

Specifications:

Specifications
Application: GM LS 4.8 / 5.3 / 6.0 Truck Engines (24x crank reluctor, Multec 2 injectors, with transmission control)
Crank Reluctor: 24x
Emissions Code: 3
Ignition Type: GM LS 24x
Injector Connector: Multec 2
Product: Term X Max LS MPFI
Controls: Fuel, Spark, Transmission
Part Number: 550-917T

Key Features
Real-time fuel learning – Automatically adjusts base fuel tables, reducing guesswork.
High-impedance injector drivers – Supports most stock LS and Holley EFI injectors (not low-impedance).
Bosch LSU 4.9 wideband – Provides accurate AFR feedback for precise tuning.
On-board 1-bar MAP sensor – Ideal for N/A or nitrous setups (2+ Bar MAP sensors can be used with GM P/N 12592525 + adapter 558-416).
4 Inputs – For additional sensors or triggers (pressure, nitrous activation, trans brake, etc.).
4 Outputs – PWM or ground for fans, boost control, nitrous, IAC kits, and more.
Boost Control – Configurable by time, gear, RPM, or speed, with built-in safety features.
Nitrous Control – Single wet or dry channel, progressive or non-progressive, with AFR safety protection.
Advanced Tables – Multiple 1D and 2D tables for custom functions like flex-fuel offsets or pressure-based safeties.
On-board diagnostic LEDs – Quickly identify ECU power, wideband status, TPS calibration, and crank/cam signals.
Compact ECU design – Mounts almost anywhere (LEDs must face up).
Plug-and-play Holley EFI compatibility – Works with gauges, shift lights, modules, and upcoming 12.3” digital dash.
Free Holley EFI software – Full laptop tuning access included.

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Domestic Shipping Options (Please note that day one is the day after the item ships):

-UPS Ground- 1-7 days. Check at www.ups.com for your location.
-USPS Priority Mail- 1-4 days but no detailed tracking with this service.
-USPS Express Mail- 1-3 days and more detailed tracking than priority.
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UPS Ground and USPS Priority Mail do not have a guaranteed shipping timeframe. If you need your item ASAP in a guaranteed number of days we highly recommend upgrading to USPS Express Mail or UPS Next Day.

International Shipping Services:

-USPS Priority Mail- 6-10 days typical delivery time, but as long as one month on rare occasions. BUYER BEWARE - NO TRACKING with this service.
-USPS Express Mail- HIGHLY RECOMMENDED 3-5 days typical delivery time with tracking, but as long as 2-3 weeks on rare occasions.
-USPS Global Express Guaranteed- 1-3 days GUARANTEED! (Most Countries, check USPS.com)
If available, this shipping service is listed in eBay auctions as "Expedited Int'l Flat Rate Shipping"
Since USPS Priority Mail International does not have tracking we strongly recommend upgrading international shipping to USPS Express Mail or to USPS Global Express Guaranteed.

International Information:

We will ship any part from any auction to anywhere in the world!
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