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Description
HP EFI ECU & Harness Kits - 550-605Overview: Looking for a plug and play alternative for your stock or built late model factory 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
Overview:
Looking for a plug and play alternative for your stock or built late model factory 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:
NEW V2 SOFTWARE FEATURES - “Quick Start” ignition and fueling strategy for LS x Engines
- Data Logger. Scalable axes, Smoothing, Multiple graph view ability, Pre-defined notes fields and many more
- Strip Chart Real-Time Data Viewer
- Integrated Boost Control - Boost vs Time, Boost vs Gear (Time or RPM), Boost vs RPM, Boost vs Speed, Launch control. Boost launch builder, Over-boost safeties, Boost scramble
- Traction Control - Power reduction via timing, nitrous percentage or boost (Requires Davis Technologies Holley Module)
- “Quick Start” fueling for all engines
- Option for VE based fueling strategy
- Fuel Map and Learn Function Smoothing
- Configurable User Password Protection
- Fully Configurable lap top Gauge Panel
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 tuning precision unmatched in the industry
Application:
| Year | Make | Model | Submodel | Engine Size |
|---|---|---|---|---|
| Universal |
Specs:
| Brand | Holley EFI |
|---|---|
| Emission Code | 3 |
| Ignition Type | Coil - (No Timing Control) |
| Ignition Type | Ford TFI |
| Ignition Type | GM HEI Small Cap |
| Ignition Type | Holley Dual Sync Distributor |
| Injector Connector | Jetronic / Minitimer (Bosch) |
| Product Type | HP EFI Kit |
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
4.4 ★★★★★
Based on 23 reviews
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Product Reviews
★★★★★ 5
Hollypet Gray is excellent
Color: Gray, Size: 14 IN
This GrayHollpet comes down the assembly line that produces a good product. It is tough and stays together Don't buy the brown one, it started to fall apart in less than 30 days.
These can be a good product!
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Reviewed in the United States on February 3, 2026
★★★★★ 4
Super cute
Color: Gray, Size: 8 IN
Super cute in person. Didn’t last two weeks with our aggressive chewer but he sure had fun with it
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Reviewed in the United States on May 6, 2026
★★★★★ 5
We call him Armie! Dog loves it.
Color: Blue, Size: 14 IN
The dog loves it! Routinely carries it around squeaking all the way. The squeak is more like a quack and makes everyone giggle. It’s nice and big so a good match for our tall dog. Probably too big though for smaller dogs. Holding up well so far and that’s no mean feat given our pup’s destruction skills.
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Reviewed in the United States on February 28, 2026
★★★★★ 5
The chewability of this toy from 1-10 is a 10 all day 👍🏻
Color: Gray, Size: 8 IN
I have a Boston Terrier and he’s a serious extreme CHEWER! He loves this Hollypet Plush Dog Squeaky Toy Stuffed Armadillo! My doh gnaws on the tail, legs, the ears and the nose and all are still in tact. He’s had it for what I consider a long time. Usually he rips toys apart in the first day but this has been months! I throw this in the washing machine with his other stuffed animal toys simply because the ears, noses and tail get so stiff from chewing on them they need to be washed and they bounce right back just like new. Chewability from 1-10 is a 10 all day long! He plays with it a for a long while each time he uses it. Very active with his Armadillo and it’s so cute and the squeaker is just right, it’s not that loud screaming squeak. If he ever lost this or it got destroyed somehow? I’d buy him this all over again. Worth the money!
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Reviewed in the United States on March 5, 2026
★★★★★ 4
Fun dog toy, but not for heavy chewers
Color: Pink, Size: 14 IN
The armadillo is cute. My pittie, Sasha, was very excited to see it. She just had TPLO surgery on her left knee (she tore her ACL just before the 4th of July), and I wanted to get her something she could play with while she convalesces, that isn't a ball—she really likes to run and jump and chase the ball, but with her knee out of commission, I didn't want her to get depressed being trapped in her crate while she heals—with this toy, she was able to keep playing and not over excert herself and get more hurt. It quickly became her favorite toy; she chews it relentlessly and gets made when I take it from her (see below).
It makes a funky squeak that's not a high-pitched squeak, like I thought it would be; it's more a low-pitched, lowing sound like a baby calf. One thing I would like to point out to other purchasers about what the description says:
"Durable and Long Lasting - Made from premium soft materials, our cute plush dog toys can withstand rough play for indoor or outdoor and last for years to come. The textured surface also helps massage and soothe your dog's gums during playtime"
This is a little misleading. It's a good texture and Sasha loved to play with it, but it wasn't very durable. It might be when compared to other chew toys, but not for my baby. She tore the nose off within 20 minutes of getting it. The next morning, she ripped off an ear, and I had to pull the stuffing out of the face so she wouldn't eat it while chewing away. She doesn't seem to mind, but I sure wish it had held up a little more.
All-in-all, this was a good toy for a few days.
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Reviewed in the United States on July 29, 2025