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Description
HP EFI ECU & Harness Kits - 550-607NOverview: Looking for a plug and play kit for your GM LS engine? The HP ECU allows you to accurately control the fuel and ignition of your engine plus much more. Got a stock LS engine? Simply download a base map and you're on your way. Got a turbocharged, nitrous fed LS engine on water meth? This HP EFI kit can control that too! Features: Simple Installation Plug and Play control of GM LS2 LS3 LS7 engines. Just plug the harness into your factory
Overview:
Looking for a plug and play kit for your GM LS engine? The HP ECU allows you to accurately control the fuel and ignition of your engine plus much more. Got a stock LS engine? Simply download a base map and you're on your way. Got a turbocharged, nitrous fed LS engine on water/meth? This HP EFI kit can control that too!
Features:
- Simple Installation - Plug and Play control of GM LS2/LS3/LS7 engines. Just plug the harness into your factory sensors, wire the power and grounds and you are ready to take complete control of your LS engine
- More Functionality - Provides significantly more functionality than OEM or other competitive ECUs (boost control, nitrous control, water/meth injection, plus a host of additional inputs and outputs to control fans, pumps, relays etc.)
- Easy To Use - Laptop programmable ECU includes a variety of base maps that will have you hitting the cruise or track in no time
- Ideal For Everything - including stock 5.3L engine swaps or all out, 3,000+ horsepower race cars that need a simple and powerful ECU and harness solution
- Industry Leading Self Tuning Fuel Strategy - means less time tuning and more time enjoying the power of your LS vehicle
- Kit includes ECU, harness, communication cable, software, Jetronic/Minitimer (Bosch style) injector connectors, and NTK wideband O2 sensor, designed to be used with GM LS2/LS3/LS7 engines with factory GM coils and a 58 tooth crank sensor
- The NTK Oxygen Sensor is recommended when using leaded or methanol fuels, high exhaust and forced induction applications or for highest precision feedback
- ECU is fully potted and can be mounted in the engine compartment or interior
- Sealed automotive and marine grade connectors
- 1-5 Bar MAP sensor capability
- Optional plug and play hand-held programmer, 5.7" touch screen and digital gauges are available for ultimate control and vehicle monitoring
- ECU is certified to ISO 8846, SAE J1171 & United States Coast Guard Requirements for Ignition Protection & Fire Resistance
- For a full list of advanced features such as boost, nitrous, water/meth, individual cylinder control and more click the document icon under the product image!
Application:
| Year | Make | Model | Submodel | Engine Size |
|---|---|---|---|---|
| Universal |
Specs:
| Brand | Holley EFI |
|---|---|
| Crank Reluctor | 58x |
| Emission Code | 4 |
| Ignition Type | GM LS 58x |
| Injector Connector | Jetronic / Minitimer (Bosch) |
| Product Type | HP EFI Kit |
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
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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]
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4.6 ★★★★★
Based on 24 reviews
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Product Reviews
★★★★★ 3
Great title mostly good copy
Format: Paperback
Great book with some minor creases
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on October 3, 2025
★★★★★ 5
Just Spectacular
Format: Kindle
I just read seven issues in one sitting and turned to my husband and told him I was sad because I just read an amazing new comic but I finished it and now I have to wait for more. This story is hard to explain, or stick in any particular comic niche. There's hitmen, vampires, ghosts, teenagers performing Sweeney Todd as their school play, apocalyptic dilemmas, addiction, redemption and a talking mole. Just wow. The art is really crisp, colorful and clean. If you liked Middlewest, I think you'll love this. Looking forward to more from these creators.
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Reviewed in the United States on May 30, 2024
★★★★★ 4
Great characters, great art, too many loose ends
Format: Paperback
I want to love it; it has great art and realistic characters in a interesting setting, but even by the end of the first volume I was left with nothing but questions. I feel like nothing ever got explained and it took away from the quality of the comic. I'm sure if I continue reading I will get the answers I want, but it feels like the pacing of the story is just a little off. Still a stellar comic.
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Reviewed in the United States on June 23, 2024
★★★★★ 5
Great
Format: Hardcover
Great
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Reviewed in the United States on April 22, 2026
★★★★★ 2
Can't get past the art
Format: Hardcover
I bought this book blind, knowing nothing about the creators and with no expectations. While I thought the story was interesting and generally well-executed, sometimes the intrusion of the writer's thoughts, the attempts to break the fourth wall, and the wink-wink, nudge-nudge gags at the fans grow tiresome.
But the writing is the strength compared to the art, which in my opinion is poor at best. The artist lacks anatomical skills, perspective skills -- the art almost never fills the frame. The splash pages are underwhelming because the figures are so small. Even the parts of the story that are supposed to be "cartoony" (the 5th dimension), which might better fit this artist's abilities, don't work.
I really feel this could have been a significantly better product with a different artist.
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Reviewed in the United States on April 25, 2026