SKU: 5404454097

Holley HP EFI ECU and Harness Kits 550-606

Sale price$1237.47 Regular price$1374.97
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Ships within 48 hours · Estimated delivery Oct 9 - Oct 14

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Description

Holley HP EFI ECU and Harness Kits 550-606FORD MPFI HP ECU AND HARNESS KIT Looking for a alternative for your stock or built late model factory FORD EFI engine? How about a replacement ECU for your older Holley C950? Holley has you covered. HP EFI ECU and harness kits are designed to be used with popular factory EFI engines as an alternative to the factory ECU and harness or as a replacement for your C950 ECU. The HP allows you to accurately control the fuel and ignition of your engine along

FORD MPFI HP ECU AND HARNESS KIT

Looking for a alternative for your stock or built late model factory FORD EFI engine? How about a replacement ECU for your older Holley C950? Holley has you covered. HP EFI ECU and harness kits are designed to be used with popular factory EFI engines as an alternative to the factory ECU and harness or as a replacement for your C950 ECU. The HP allows you to accurately control the fuel and ignition of your engine along with additional controls for nitrous, boost or water meth.

Features:

  • Optional 5.7” full-color touchscreen LCD allows easy on-the-fly tuning,data-logging or can be used as an easy to see graphical gauge panel
  • Eight sequentially driven 8:2 peak and hold injector drivers, capable of driving up to 16 low or high impedance injectors as a standard feature. Multiple staged injector strategies
  • Eight channel Distributorless Ignition (DIS)outputs capable of directly driving “Smart” ignition coils or Holley DIS coils. Will drive 2 wire coils with the addition of PN 554-112 high current coil driver module
  • Plug and Play control of factory GM 24x and 58x LSx engines
  • Integrated single channel wide band oxygen sensor control. Works with NTK or Bosch sensors
  • Internal data-logging standard with a huge 2GB of memory
  • 4 Stage progressive nitrous control
  • Turbo boost control
  • Integrated water/methanol injection control
  • Self-tuning fuel table strategy greatly simplifies tuning process
  • Individual cylinder fuel and spark control allows you to unlock your engine’s potential
  • Works with 4, 6, 8 cylinder engines
  • Unique lb/hr based fueling strategy greatly simplifies and commonizes tuning
  • Advanced idle, closed loop, and enrichment strategies allow for very stable operation
  • ECU is fully potted and can be mounted in the engine compartment or interior
  • Sealed automotive and marine grade connectors
  • Allows for use of common OEM sensors as well as customer sensor calibration input
  • Ignition Plug and Play with GM 24x and 58x LSx engines, GM HEI, Ford TFI, magnetic and hall effect trigger, and other ignition systems. New Plug and Play applications in process. Custom settings can be configured to allow many other applications
  • 1-5 Bar MAP sensor capability
  • Two channel knock control sensor Inputs for both one or two wire knock sensors
  • Dedicated fuel and oil pressure inputs
  • Controls both stepper and PWM Idle Air Control (IAC) motors
  • Speed density, Alpha-N, or combination fueling strategies
  • 4 Programmable high or low Pulse Width Modulated (PWM) outputs and 4 fully configurable inputs can be configured for use
  • 4 Stage nitrous oxide control
  • Fully featured nitrous control eliminates the need for a separate nitrous controller device
  • Can be configured “Wet” or “Dry” with closed loop feedback
  • Progressive control based on time, RPM, or boost, requires part # 554-111
  • Lean or rich safety cutoff
  • Full timing retard/control configurability per stage based on RPM or time
  • Integrated Water/Methanol injection control
  • Uses Holley Water/Meth solenoids specially designed and calibrated for use with this EFI system to allow the user to enter Water/Meth flow as a percentage of fuel injector flow for Water/Meth tu

Application

  • Universal

Specs

Brand Holley EFI
Emission Code 3
Ignition Type Coil - (No Timing Control)
Ford TFI
Holley Dual Sync Distributor
Injector Connector Jetronic / Minitimer (Bosch)
Product Type HP EFI Kit
Part Number 550-606
Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 5404454097

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4.8 ★★★★★
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Sholom
Cuba, US
★★★★★ 5
Great Mat, Slight Grip Issue (lika all mats)
Color: Black
Comfortable and solid for workouts, but it can be a bit slippery on the floor during intense poses. Still a great overall yoga mat.
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Reviewed in the United States on May 26, 2026
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Nicky
Birmingham, US
★★★★★ 3
The tear-iest anti-tear mat
Color: Green
The good: It's super thick and squishy. So it has that nice bouncy feeling when you're using it. The strap is easy to secure on the mat as well once it's rolled up. The color is also super cute. The bad: it's not Anti-Tear. It says in the name that it is, but the second I got it it tore. Only a little bit but still. For how cheap it is, I don't mind, but keep that in mind if you're buying this.
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Reviewed in the United States on May 1, 2026
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Christina
Houston, US
★★★★★ 5
Love
Color: Deep Wine
This is a great quality, thick and pretty colored yoga mat! It's easy to roll up and put away and of course, just as easy to sanitize than the yoga mats with the little dips and crevices in their designs.
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Reviewed in the United States on April 13, 2026
A
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Amazon Customer
Boise, US
★★★★★ 5
Thick & sturdy.
Color: Blue
Great mat! Nice thick, sturdy foam! -- Im using it along my raised garden beds so I can crawl across the area that's covered w wood chips to work. I cover up lumber edges w old staples with one edge too, and can push myself up & slide it along beneath me. Great on my knees and elbows. Eliminates the need to constantly get up & down. Nice thick, sturdy foam! Gets slippery fast if I hit it w the hose!
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Reviewed in the United States on May 24, 2026
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Kelly B. - Honest Hands-On
Fort Morgan, US
★★★★★ 5
Durable and Comfortable Yoga Mat That Lasts
Color: Red
The BalanceFrom Go Yoga All Purpose Exercise Mat has proven to be a long-lasting and reliable piece of equipment. After seven years of use, it still holds up well, showing how durable the anti-tear material really is. The thickness provides great cushioning for yoga, stretching, or floor workouts, making it comfortable to use on hard surfaces without slipping. The included carrying strap makes it easy to transport to classes or the gym, and the lightweight design is convenient without sacrificing support. Even after years of use, the mat remains easy to clean and hasn’t worn down the way cheaper mats often do. While the surface may show some signs of age, the overall performance has stayed strong, which makes it an excellent value for the price. Pros: Extremely durable even after years, comfortable cushioning, and convenient with a carry strap included. Cons: The surface can show wear over time, it may feel bulky compared to thinner mats, and the texture may not suit those who prefer a firmer grip. A dependable yoga mat that lasts for years while staying comfortable and practical. For anyone looking for a durable, affordable mat, this one delivers excellent long-term value.
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Reviewed in the United States on August 30, 2025

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