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Ships within 48 hours · Estimated delivery Jul 14 - Jul 19
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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
4.5 ★★★★★
Based on 308 reviews
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Product Reviews
★★★★★ 4
Durable toy with a single squeaker
This goose seems to be made of fairly durable fabric. It's not flimsy. I had a hard time finding the squeaker in it at first, but then I realized the squeaker is located in the white neck!
My medium border collie grabbed it first. Then my pitbull figured out where the squeaker was and ran around squeaking it for a while, which is her favorite thing to do. So this toy did get some interest from the pitbull especially. She isn't one to chew things up but really enjoys toys that make noise. Since the squeaker is in the skinny neck portion, it made it easy for her to grab hold of it and squeak it over and over again.
I am giving this 4 stars only because in the whole long body of this toy, the neck has the only squeaker. I think it would have been better and more stimulating for my dogs if it had multiple squeakers or even some crinkles in the rest of the body...at least some crinkles in the flat feet of the duck. The sole attraction is that one squeaker in the neck. So it could be better, but I do like that it isn't super plush and full of stuffing that would be torn up in 5 minutes like most toys.
My pitbull actually took this to another room away from her three sisters, so that means she really wanted to play with this by herself. That's a good sign.
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Reviewed in the United States on October 28, 2025
★★★★★ 5
Duck-time is play-time! Exactly what a dog toy should be!
Duck hunting for your living-room princess-pal best buddy goodest puppy in the world!
Every dog deserves a chance to be a heroic duck hunting hero!
This dog toy is a favorite of my pup. Duck-time is play time! This duck is made with several fabulous textures. There's a ropey texture around the neck, a burlap type texture for the body and head, and a felt-like texture for the bill and feet.
My dog immediately tore the feet off! He always removes any hanging bits from all toys, so that's not a comment to the detriment of this product. He's working on the wings, now.
My dog likes to chase this toy when I throw it or play tug-of-war with it, or is willing to sit and chomp on it by himself for a while. The rope is intact, still!
This is exactly what a dog toy should be! Give your little buddy a hunting trophy!
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Reviewed in the United States on November 2, 2025
★★★★★ 2
Speaker broken
This toy is advertised as having a squeaker, but the one we had was defective and did not make any noise. Our dog still throughly enjoyed ripping this little duck to shreds through. The material was thicker than I was expecting but still only took our dog about 5 mins to completely destroy it (Golden retriever). I understand that this toy is marketed as for small dogs so I get that, but took away three starts because our came with the broken squeaker and for $10, you can find a lot better toys at TJ Max. This item is not a good value for our experience.
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Reviewed in the United States on November 1, 2025
★★★★★ 5
Durable duck toy for man’s best friend
Although it was suggested that this toy would be best for small breeds, I found that it’s durable enough for my 80 pound Irish setter! It has literally become his best friend. He takes it everywhere he goes! There’s a small squeaky noise that comes from the neck area that he has to work to find. I’m sure he will eventually destroy this as he has with all his other toys, but it’s really holding up much better than anticipated.
It is well worth the $10 cost.
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Reviewed in the United States on November 9, 2025
★★★★★ 5
Really cute, well made dog toy. Was a huge hit with our pup
This toy was a big hit!
Pros
- love the heavy duty burlap-kinda fabric. Our new puppy has razor sharp teeth but this fabric is holding up really well.
- size is great for a variety of breeds
- shape is perfect for grabbing onto. Our puppy especially likes picking it up on the neck where the toy is more slender
- the extra little feet and wing flaps add some interest that have really kept her occupied
Cons
- the squeaker is in the neck where the fabric has embellishments and is a little thicker. It's a little hard to activate the squeaker but maybe the toy/stuffing needs to get broken in more and then it will be easier to squeeze that section
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Reviewed in the United States on October 29, 2025