Holley · Part 550-933
Holley EFI Terminator X Max MPFI Kit - Gen IV 4.8/5.3/6.0 Truck & LS2/LS3, 58x / 4x, EV1 Injectors, Drive-by-Wire, 3.5" Touchscreen
GM Gen IV LS (4.8/5.3/6.0 truck, LS2, LS3) with 58x crank / 4x cam; EV1 injector connectors; drive-by-wire throttle body control (GM pedal 10379038 recommended, not included). Transmission control is a different part number (Max trans kits).
$1,999.95
In stock in Corona. Free shipping in the continental US, or collect it at the shop.
No returns or exchanges on third-party hardware — the manufacturer’s warranty is the warranty. Returns policy
Emissions
What it is and what it fits
GM Gen IV LS (4.8/5.3/6.0 truck, LS2, LS3) with 58x crank / 4x cam; EV1 injector connectors; drive-by-wire throttle body control (GM pedal 10379038 recommended, not included). Transmission control is a different part number (Max trans kits).
What it does
- Adds drive-by-wire control so the factory DBW throttle body and pedal can be kept
- Max ECU also supports 4L60E/4L80E control with the correct harness
- Same 8-injector / 8-coil, self-learning core as Terminator X
- CAN-compatible with Holley dashes, gauges and modules
Fitted and tuned on our hub dyno, or shipped to you
Buy it and fit it yourself, or have us do it. We install, wire and calibrate Holley engine management in our Corona shop and tune it on a Mainline ProHub hub dyno, with the full sheet at the end. Shop labor is $265 an hour, quoted against your car; the calibration is priced on the standalone tuning page.
It is in stock in Corona and ships free anywhere in the continental US. Alaska and Hawaii are quoted by phone. If you would rather collect it, or have it waiting here for your install, say so at checkout.
Specifications
Holley 550-933
- Brand
- Holley
- Part number
- 550-933
- Injector drivers
- 8, sequential, high-impedance (saturated) only - will not drive low-impedance injectors
- Ignition outputs
- 8 coil-on-plug outputs (direct drive of LS smart coils)
- Programmable inputs
- 4 (12V, ground, 5V, frequency)
- Programmable outputs
- 4 (ground / PWM)
- MAP sensor
- Internal 1-bar; external 2+ bar via GM 12592525 + Holley 558-416 adapter
- Wideband
- Bosch LSU 4.9 closed-loop control (LSU 4.2 not supported)
- Fuel learn
- Real-time self-learning base fuel table
- Boost control
- Boost vs time / gear / RPM / speed, with safeties
- Nitrous control
- 1 channel wet or dry, progressive or non-progressive, rich/lean safeties
- User tables
- 4x 1D, 1x 1D per-gear, 4x 2D, 1x 2D per-gear
- ECU size
- 7.45 x 4.1 x 1.66 in; diagnostic LEDs must face up
- Throttle control
- GM LS/LT drive-by-wire
- Logging
- Handheld SD card; laptop software
Questions
Before you buy
Is this the price other dealers charge?
Yes. $1,999.95 is the price authorised Holley dealers advertise, and DEFI is an authorised Holley dealer. Shipping in the continental US is free on top of that.
Will it fit my engine?
Read the fitment above against your engine, sensors, injectors and throttle before you buy. If anything is unclear — a part number, a connector, a transmission — call us first. That conversation is free; a wrong unit is not.
Can I return it if it is the wrong one?
No. There are no returns or exchanges on third-party hardware once it ships — the manufacturer’s warranty is the warranty. That is why we would rather answer the fitment question on the phone before you order.
Is it street legal?
Holley publishes no CARB Executive Order for this kit. It is sold for racing and for vehicles that are not emissions-controlled: it is not legal on a pollution-controlled vehicle registered in California, and a vehicle running it will not pass a smog inspection. We are not going to imply otherwise.
Can you tune it for me?
Yes. We calibrate Holley standalones on our hub dyno in Corona, and we can review logs remotely if the car is somewhere else.