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Description
HP EFI ECU & Harness Kits - 550-607Overview: 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 Bosch wideband O2 sensor, designed to be used with GM LS2/LS3/LS7 engines with factory GM coils and a 58 tooth crank sensor
- 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.
- 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
4.1 ★★★★★
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Product Reviews
★★★★★ 5
Hey, it's Diet Coke. It's so popular, there's a button for it in the Oval Office!
Flavor Name: Diet Coke, Size: 16.9 fl oz (Pack of 6)
This is a refreshing taste. Not as good as Zero Coke, but still good.
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Reviewed in the United States on May 12, 2026
★★★★★ 5
Thank you, Amazon
Flavor Name: Diet Coke, Size: 16.9 fl oz (Pack of 6)
The price is great. The cove is great and having it delivered and always having it is unbelievable thank you Amazon.
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Reviewed in the United States on May 19, 2026
★★★★★ 5
Fresh crisp and refreshing
Flavor Name: Diet Coke, Size: 12 Fl Oz (Pack of 12)
I’d love Diet Coke. That’s just the type of person I am. I was pleased to see the Amazon sold this. It was a great value for the money. I got the 12 ounce cans in the 12 pack. The flavor was great. There was no problem with leakage or smash cans and I’m just very happy I was able to purchase this through Amazon. ..
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Reviewed in the United States on May 18, 2026
★★★★★ 5
Gotta have my Diet Coke
Flavor Name: Diet Coke, Size: 12 Fl Oz (Pack of 12)
What can I say? I don’t drink coffee but Diet Coke is my daily morning fix! I love Diet Coke in the can better than the bottle unless I come across some bottles that have good carbonation, but they always seem to be a little lacking! Not so most of the time with the cans, but I love the taste of Diet Coke!
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Reviewed in the United States on May 9, 2026
★★★★★ 4
Do you think they are playing with the flavor?
Flavor Name: Diet Coke, Size: 16.9 fl oz (Pack of 6)
Drinking this since 1980...
The flavor has changed.
Beloved burning carbonation replaced with a hot peppery aftertaste. And it used to be a little sweeter. Still my dark colered
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Reviewed in the United States on April 28, 2026