GM LS & Gen V LT
$—
Holley EFI — Authorized Dealer
Terminator X & X Max
Plug-and-play standalone EFI for GM LS & Gen V LT. Self-learning fuel, Bosch LSU 4.9 wideband, 1-bar MAP, boost & nitrous control built in.
Every Kit Includes
Terminator X ECU — main power + I/O harness
Engine Main Harness — matched to your crank reluctor
Injector / DI Harness — EV1, EV6, Multec 2, or GDI
Bosch LSU 4.9 Wideband — O2 sensor included
Real-Time Fuel Learn — base maps for common combos
Need a Basemap? Contact us and we can make you a map to get you running way better than the handheld basemap wizard.
Build Your Terminator X
1 Engine Generation Please Select
24x LS
Gen 3 · most 1997–2006 LS
58x LS
Gen 4 · most 2007–2013 LS
LTx Direct Injection
Gen 5 · most 2014 & newer
2 Injector Style Please Select
Select your engine generation above to see the matching fuel & injector options.
Gen V LT kits run the factory direct injectors and include an external GDI controller for injection pressure, VVT, and the factory fuel pump. Early vs Late is set by your fuel-pressure sensor — 4-pin = early, 3-pin = late.
3 Throttle Body Please Select
DBC · Cable
Mechanical throttle · Terminator X
DBW · Electric Throttle Body
Drive-by-wire · X Max
X Max feature
4 Transmission Control Please Select
Manual / Non-Electric
TH350 / TH400 · 700R4
4L60 / 4L80
4-speed auto · X Max
X Max feature
6L80/90
6-speed automatic · X Max
X Max feature
5 Tuning Interface Please Select
3.5" Touchscreen
Handheld w/ calibration wizard
USB / CAN Cable
Laptop tuning · no handheld
− $50
Terminator X vs X Max
| Feature | Terminator X | X Max |
|---|---|---|
| Self-learning fuel | Yes | Yes |
| Boost & nitrous control | Yes | Yes |
| Drive-by-Wire throttle | — | Yes |
| Transmission control | — | 4L / 6L auto |
| Gen V LT direct injection | Yes (GDI ctrl) | Yes (GDI ctrl) |
Not sure which crank reluctor you have?24x is most '97–'06 LS; 58x is most '07–'13 LS; LTx direct injection is most '14+. Text us your VIN or engine and we'll confirm.
Common Questions
Will it control my stock injectors?
Yes — high-impedance drivers run most stock LS and Holley injectors. LT kits run the factory direct injectors via the included GDI controller.
Do I need the handheld?
No. The USB/CAN cable version tunes from a laptop with the free Terminator X software and saves $50. Add a handheld later anytime.
Early or late LT kit?
Check the fuel-pressure sensor behind the intake: 4-pin = early, 3-pin = late. Send us a photo and we'll confirm the right kit.
Is a custom tune required?
Base maps get you running; a custom tune unlocks the power and drivability. We offer in-house dyno and street tuning.
Terminator X + Tune — One StopBuy your kit through Hi-Rev and we'll set it up and tune it. Contact us for a package quote.
Holley EFI
Need a hand choosing your kit?
We'll match the exact 550-9xx / 550-16xx part number to your engine, trans, and goals.