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Description
Holley HP EFI ECU and Harness Kits 550-604MPFI HP ECU AND HARNESS KIT 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
MPFI HP ECU AND HARNESS KIT
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:
- 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
- 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 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
-
Universal
Specs
| Brand | Holley EFI |
|---|---|
| Emission Code | 3 |
| Ignition Type | Coil - (No Timing Control) |
| Ford TFI | |
| GM HEI Small Cap | |
| Holley Dual Sync Distributor | |
| Injector Connector | Jetronic / Minitimer (Bosch) |
| Product Type | HP EFI Kit |
| Part Number | 550-604 |
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
4.3 ★★★★★
Based on 24 reviews
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Product Reviews
★★★★★ 4
Flimsy
Color: Beige, Size: 8 Panel
It’s thinner than what I thought and flimsy.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 2, 2026
★★★★★ 5
8 panel Room Divider is excellent quality
The GoFlame 8 Panel Room Divider is made with excellent material and the seller of this Divider is totally customer friendly. I highly recommend this company and this Divider if you are shopping for a room divider.
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Reviewed in the United States on April 25, 2026
★★★★★ 5
A Versatile and Elegant Solution for Room Separation
I recently purchased the GOFLAME 8 Panel Room Divider, and I'm thoroughly impressed with its quality and design. This room divider is not only a decorative element, but it also provides a practical solution for creating distinct areas within a room. Here's why I'm giving it a 5-star review:
Enhanced Privacy Space:
The 6 ft tall room divider is perfect for creating a private space within a larger room. It's ideal for my home office, and I can use it to separate my workspace from the rest of the room. The screen also creates a cozy and intimate atmosphere, making it perfect for relaxing or reading.
Hand-woven Texture:
The unique hand-woven texture of the room divider adds an element of sophistication and warmth to my room. The intricate craftsmanship is impressive, and it exudes artisanal charm. I love the way it looks, and it's become a conversation piece in my home.
Built with Strength:
The solid wood frame is sturdy and well-constructed, providing reliable support for the room divider. I'm impressed by the attention to detail and the quality of the materials used.
Foldable Design and Easy Storage:
The foldable design of the room divider makes it easy to store when not in use. I can simply fold the panels flat and store them away, which is convenient and space-saving. The metal hinges that connect the panels are also sturdy and well-made.
No Assembly Required:
I was pleasantly surprised to find that the room divider requires no assembly. I simply took it out of the box and set it up, and it was ready to use. The smooth woven surface is also easy to clean and maintain.
Overall Impression:
I'm thoroughly impressed with the GOFLAME 8 Panel Room Divider. It's a stylish and functional solution for creating a private space within a larger room. The hand-woven texture and solid wood frame add an element of sophistication and warmth, and the foldable design makes it easy to store. I
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Reviewed in the United States on September 14, 2024
★★★★★ 5
Quality product !
This is a quality lightweight room divider.! Actually is the second one of this type that I have bought. If you have an area that you just want to close off from the rest of the room, these work perfect!!!
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Reviewed in the United States on October 14, 2025
★★★★★ 5
It suits me very well
I have a very large room. Its layout is perfect for me to convert into two rooms. Adding this screen is perfect and matches the style of my house.
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Reviewed in the United States on August 29, 2024