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Holley EFI 550-406 - Terminator EFI 4bbl Throttle Body Fuel Injection System - Hard Core Gray

Terminator™ EFI 4bbl Throttle Body Fuel Injection System V8 4 bbl 950 cfm Range 250 To 600 HP

An EFI System so easy and powerful you'll think it's alive! Simply bolt it on, feed it a few basic answers and let Terminator EFI take control of your ride!

- Easy to install
- No computer experience required
- Handheld tuner included
- Simple multiple choice set-up wizard
- Self-tunes while you drive
- Upgradable to complete laptop control without buying another ECU
- Carburetor replacement EFI from the fuel systems experts!
Availability: Call to check stock.
Shipping: Free Shipping* On Orders Over $99!
Pricing: $2,661.95

Free U.S. Continental Shipping


Fully self-tuning ECU - No laptop required
Trouble-free performance with today's fuels - put an end to vapor lock and fuel varnish problems!
Terminator ECU can be EASILY updated to Holley HP ECU specs with a free online software download. ECU can then be used for LSX, boosted, nitrous, and many other applications in the future as you desire!
ECU fully potted and sealed for protection from vibration, dust and moisture
Provides ignition timing control on engines with Small Cap HEI and Ford TFI distributors (requires adapter)
80 lb/hr injectors support 250-600 HP engines
Fits any square (Holley 4150„¢) flanged intake
Connections for Ford, GM TH350 and 700R4, and other transmission linkages
Serviceable sensors integrated into throttle body and pre-wired for a simple one-click connection - don't get stranded by competitive designs
Patent pending annular discharge fuel ring for maximum flow and optimum fuel atomization - No restrictions or delay in fuel flow like booster designs
950 CFM Throttle Body with CFD computer designed air-entry area taken from Holley's famous NASCAR® throttle body - as found on all NASCAR Sprint Cup Series„¢ cars
Virtually maintenance free - keeps your vehicle reliable and ready to drive
Self-tunes instantly to deliver the perfect air/fuel mixture in real time for optimized fuel economy and power
Industry leading tech support - free!

California Proposition 65

California Prop 65WARNING: Cancer & Reproductive Harm -


Fits all standard square flange intake manifolds. Connections for Ford, GM TH350 and 700R4, and other transmission linkages. Includes TBI unit, ECU, handheld programmer, wiring and all sensors. Does NOT include fuel pump, fuel lines, regulator or filters.


  • 550-406
  • 550-406
  • 090127685099
  • Holley EFI
  • Call to check stock.
  • New


Shipping Information

  • Item Requires Shipping
  • 14.0 lbs.
  • W13.0000” x H6.5000” x L25.0000”
  • Free U.S. Continental Shipping
  • Free Shipping* On Orders Over $99!


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