Holley · Part 550-1611
Holley EFI Terminator X Max GM Gen V LT Direct Injection Kit - Late, with 4L60E/4L80E Transmission Control
GM Gen V LT1 / L83 / L86 direct-injection engines, 'late' style - identified by a 3-pin fuel-rail pressure sensor connector behind the intake. Uses the factory DI injectors, VVT and DI high-pressure pump via an external GDI controller. GM LS/LT drive-by-wire (Max) and 4L60E/4L80E transmission control. Not the LT4 kit (LT4 = 550-1623 early / 550-1624 late).
$3,299.95
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 V LT1 / L83 / L86 direct-injection engines, 'late' style - identified by a 3-pin fuel-rail pressure sensor connector behind the intake. Uses the factory DI injectors, VVT and DI high-pressure pump via an external GDI controller. GM LS/LT drive-by-wire (Max) and 4L60E/4L80E transmission control. Not the LT4 kit (LT4 = 550-1623 early / 550-1624 late).
What it does
- Runs a Gen V LT swap with direct injection, VVT and the DI pump without the GM ECM
- Diagnostic LEDs add VVT, pump and DI injector status
- One ECU covers engine, DBW and 4L60E/4L80E
- Boost and nitrous strategies built in
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 550-1611
- Brand
- Holley
- Part number
- 550-1611
- Injection
- Gasoline direct injection via external GDI controller; factory LT DI injectors supported (part numbers in wizard)
- VVT
- GM Gen V LT cam phaser control
- Fuel pump
- Controls factory DI high-pressure pump
- Ignition outputs
- 8 coil-on-plug
- Throttle control
- GM LS/LT drive-by-wire
- Transmission control
- GM 4L60E / 4L80E
- Programmable inputs
- 4 (fuel and oil pressure inputs pre-terminated)
- Programmable outputs
- 4 (ground / PWM)
- MAP sensor
- Internal 1-bar; external LT MAP for boost
- Wideband
- Bosch LSU 4.9 (LSU 4.2 not supported)
- Logging
- Handheld SD card; laptop software
Questions
Before you buy
Is this the price other dealers charge?
Yes. $3,299.95 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.