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Description
Holley HP EFI ECU and Harness Kits 550-606NHP ECU AND HARNESS, FORD MPFI, NTK 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
HP ECU AND HARNESS, FORD MPFI, NTKLooking 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
- Includes NTK wideband oxygen sensor
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 | 550-606N |
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- 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
4.8 ★★★★★
Based on 28 reviews
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Product Reviews
★★★★★ 5
Cute angel to add to your garden decor...
I added this angel statue to my porch, and it’s even sweeter in person than I expected. The resin feels sturdy and well‑made for the cost, and the colorful little birds look charming during the day and glow softly at night once the solar panel has charged. It’s lightweight enough to move around easily but still feels solid, and the details on the angel give it a gentle, peaceful look that fits nicely among plants or on a small table. After a full day in the sun, the lights come on automatically at dusk, and the warm glow makes the space feel cozy and inviting. It’s a lovely decorative piece that also makes a thoughtful gift.
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Reviewed in the United States on April 4, 2026
★★★★★ 4
Very cute angel!
My Mom collects angels, and also loves spending her summers gardening. This is the perfect statue to put in her flower garden! It is lightweight, and the birds light up at night, thanks to the solar panels that charge it during the day. The different colored birds all light up, and look adorable. It was well built and looks nice on a porch or in a garden. You need to be careful where you put it, because it will blow over in high winds. It hasn't broken, after being blown over so it is durable! The faces doesnt have as much detail as I would like, but it does look the same as the photos in the description. Since its mostly viewed from far away, it doesn't need a lot of detail. Its easy to tell what it is from far away and it looks great and will match most decors.
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Reviewed in the United States on March 6, 2026
★★★★★ 5
Precious Angel Garden Statue with 5 Birds!!!!!!!
This garden angel reminded me of an angel that my mother had in her garden. My mother and I both loved birds so when I saw the angel had five birds perched on her arms and head, I had to have it! The angel is so pretty and delicate with her arms raised into the air, yet it is made of resin to withstand the outside elements. The birds are in color, finished with protect coating. There is a blue, red, green and two yellow birds, and they are SOLAR so the birds light up at night!!!!! You do need to turn on the switch and place the angel in direct sunlight for 6-8 hours of charging before using. The birds will light up automatically at night for 8-10 hours since the light is automatically photosensitive. The angel is on the small side at right under 12” tall so I will put her in one of my flowerpots on the deck instead of out in the garden on the ground. I placed her outside in a pot, but I may keep her inside the house where I can see her all the time. As long as the angel gets light during the day, she will be charged to light up at night. The angel would make a great gift for any occasion!
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Reviewed in the United States on February 28, 2026
★★★★★ 5
Fun
Color: Green
Was fun to play tug of war with my dog till she completely destroyed it by taking out all the stuffing, squeakers, and ripped the limbs off. Soft before dog droll and weather stiffened it. She liked to leave it outside for some odd reason like her other toys.
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Reviewed in the United States on May 14, 2026
★★★★★ 5
Surprisingly Durable, Very Soft, and All of My Dogs Immediately Loved It
Color: Green
I honestly expected this to be just another cute plush squeaky toy that would last maybe a day or two in a house with multiple dogs, especially larger breeds, but I was pleasantly surprised by how well this one has held up so far.
The fabric is very soft without feeling overly thin or cheaply stuffed, and the toy arrived fully intact with no strange chemical smell right out of the packaging, which I always appreciate when buying toys for dogs that immediately put everything in their mouths. The stitching also looked much better than many inexpensive plush toys I’ve purchased in the past.
All of my dogs immediately gravitated toward it — from my Dobermans to my smaller dogs — which honestly says a lot because they can be very selective about textures and squeakers. The squeaker itself is loud enough to keep their attention without being one of those painfully obnoxious high-pitched squeaks that make you regret purchasing the toy five minutes later.
I also appreciate that the fabric is soft enough for indoor play and carrying around the house without feeling overly rough or stiff the way some “durable” dog toys can feel. It has held up surprisingly well to daily tossing, carrying, squeaking, and general chaos so far.
For the price, I actually think this is a very good value, especially if you have multiple dogs or dogs that enjoy plush comfort toys but still like squeakers and interactive play. It arrived quickly, packaged well, and looked exactly like the listing photos upon arrival.
Very happy overall and would absolutely purchase additional styles again.
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Reviewed in the United States on May 11, 2026