SKU: 44499070246

Holley HP EFI ECU & Harness Kit (HO550-601)

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Description

Holley HP EFI ECU & Harness Kit (HO550-601)HO550 601 HP EFI ECU WITH HARNESS Suit GM TPI & Holley Stealth Ram Part Number: HO550 601 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

HO550-601 - HP EFI ECU WITH HARNESS

Suit GM TPI & Holley Stealth Ram

Part Number: HO550-601

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.
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/Meth

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SKU: 44499070246

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Product Reviews
J
Jimmy R. Reagan
Dallas, US
★★★★★ 5
One of the Best!
Format: Paperback
Kelly Kapic is one of the best theological writers of our day. He gears his writings a bit toward scholars, but don’t let that stop you. Accept the challenge of this book and you won’t be sorry. The title of the series (“New Studies in Dogmatics”) might scare off some readers, but don’t allow that to camouflage a great read. Yes, scholars will likely eat it up as a book that shows an artisan at work in their trade, but I say pastors and thoughtful Bible students ought to claim this one as their own. The only part that might appeal more to scholars than the rest of us is how he loves to delve into some historical personage or creed to illustrate his point. That is only an issue because sometimes that takes more explanation than the point at large he is making. I doubt he can help it. He seems like a walking encyclopedia; a passionate one to be sure, but it is amazing the scope at which he views his subject. His clearly stated thesis is that “Christian life is a response to the love of God”. Not only does that make sense, especially as he develops it, but it also gave him free reign to write across most of the systematic theology corpus as he desired. That could easily degenerate in a muddled mess that said little, but in his skilled hands it became something really special. In fact, the first chapter on why we need a theology of Christian life shows his clear vision of the argument of this book. For the record, I was bought in part way through that first chapter. Part Two with its three chapters fills in “the love of God” part of his thesis. He approaches it as love, grace and fellowship. Those three are often thrown about with a perverse shallowness. Not here. It seems that the depths of the heinousness of sin that he so astutely explains is the key to bringing those three out in all their resplendent glory. Here they sparkle. Next, he has a section that he called an “interlude” on the Law-Gospel distinction. His Reformed orientation comes out strongest here and this section is likely to be the most controversial. In fact, even some Reformed thinkers might quibble with him. From there, he develops the “response to” part of his thesis. This last section covers Messiah, ego and ecclesia to great effect. That our Messiah is the key is painted with the right significance. The chapter on ego was profoundly done. I thought he brought in current thinking on ego and held it up to Scripture and came up with clear thinking in the process. The two chapters on ecclesia surprised me. I was sure that he was going to champion a certain strain of liturgy, but actually he explained that every worship style is a liturgy. It was convincing to me. I nominate this book as the theological title of the year. It is that good. I received this book free from the publisher. I was not required to write a positive review. The opinions I have expressed are my own. I am disclosing this in accordance with the Federal Trade Commission’s 16 CFR, Part 255.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 26, 2026
B
BDH
Cuba, US
★★★★★ 5
A labor of love
Format: Paperback
Kelly Kapic provides a biblical and theological vision of Christian life—what it means to love and be loved by God—by exploring and explaining the contours of the “life” that is given to the believer as united to Christ, and united to all believers who participate in that same union. The book covers multiple topics one might find in a systematic theology, but seamlessly weaves these through considerations of Christian ethics and corporate worship with clear and accessible prose. Kapic writes charitably as someone deeply immersed in the history of Christian theology and aware of the modern Christian church as expressed through multiple, and sometimes conflicting, traditions. Kapic remains attentive to the doubts of believers and profoundly sympathetic to the reality of those who have suffered abuse under the banner of grace. A remarkable achievement of beautiful orthodox theology. Highly recommended.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 11, 2026
D
Verified Purchase
Dadhich Sawant
Massapequa, US
★★★★★ 5
Nice Product
Color: 2 Tier-Black, Color: 2 Tier-Black
Super Handy and So Stylish — A Must-Have for Any Kitchen! I’m really impressed with the Sinnsally Kitchen Sponge Holder! It’s simple, practical, and makes keeping my sink area neat so much easier. The 2-tier design is brilliant — the top shelf holds my sponges perfectly, while the bottom area keeps scrubbers and brushes organized and easily accessible. The stainless steel looks sleek and modern, and it has held up beautifully with daily use. Water drains well so everything dries quickly, and cleanup is a breeze. No more soggy sponges sitting around! Installation was quick and easy — it fits nicely right by the sink without taking up too much space. This little holder has made a big difference in keeping my kitchen tidy. Highly recommend for anyone who wants a clean, organized sink area with a touch of style!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 3, 2026
V
Verified Purchase
Victoria J.
Battle Creek, US
★★★★★ 5
Great space saver
Color: 2 Tier-Black
I love how this makes my sink so much more organized. For me, it holds a 20oz dish soap, a dish spray, 2 S.O.S. pads, 2 sponges, a steel wool scrubber, a bottle brush, a Stanley cap cleaner, and a sink stopper. I could still fit more if I wanted to. I can move the tall brush holder to whichever side I want, as well as the divider. It was super easy to put together, and functions well by draining all the drips right into my sink, instead of behind it. The black looks great and matches my kitchen well. This organized is built well and keeps mynsink area tidy and hygienic.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 18, 2025
A
Verified Purchase
Annie
Massapequa, US
★★★★★ 5
It Looks Nice and It Works
Color: 1 Tier-Black
I like it. It is too long for my sink area, but it still works. Next to my sink is a dish rack. One half of the caddy fits perfectly behind it, holding a 16oz bottle of dish soap and a 16oz bottle of multi-surface cleaner. The part of the caddy that fits on my sink ledge holds a sponge, scrubber and scouring pad, The caddy works great at keeping the ledge dry. It is a very nice, well-designed item. I recommend this caddy it's keeps everything organized and dry.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 23, 2026

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