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Description
Holley HP EFI ECU and Harness Kits 550-603HP ECU AND HARNESS LS2 & LS7 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
HP ECU AND HARNESS LS2 & LS7
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, USCAR (EV6 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
- Universal
Specs
| Brand | Holley EFI |
|---|---|
| Crank Reluctor | 58x |
| Emission Code | 4 |
| Ignition Type | GM LS 58x |
| Injector Connector | USCAR (EV6) |
| Product Type | HP EFI Kit |
| Part Number | 550-603 |
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
4.0 ★★★★★
Based on 13 reviews
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Product Reviews
★★★★★ 5
Perfect sunscreen
Style: SPF 50 Roll On, Size: 3 Fl Oz (Pack of 1)
I love the roll on sunscreen. It is quicker to apply and my little one can help without squeezing sunscreen everywhere. Will buy again.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on June 14, 2025
★★★★★ 5
Roll on is so easy to use.
Style: SPF 50 Roll On, Size: 3 Fl Oz (Pack of 1)
Favorite brand and the roll on is so easy to use
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on June 3, 2026
★★★★★ 3
Protection with days of white residue
Style: SPF 50 Roll On, Size: 3 Fl Oz (Pack of 1)
Mineral sunscreens have yet to master blending in and this is no different. If you're thinking of hitting the beach with your sexy bum protected it'd better be a ghost beach because you'll look like you've been dipped in white paint. Oh, and it doesn't wash off, so be prepared to look like Casper for days to come.
It rolls on fine if you shake it well first and it does protect.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on June 8, 2025
★★★★★ 5
Neutrogena clear face loción de protección para el sol
Size: 3 Fl Oz (Pack of 1), Style: SPF 50
Neutrogena Clear Face Sun Protection Lotion is one of the most popular options for the face, especially if you have oily or acne-prone skin.
General opinion: it is a very good sunscreen for daily use, light and designed not to cause outbreaks.
The positive:
* It is oil-free and non-comedogenic, that is, it does not usually cover pores
* It has a light texture and "matte" type, it does not leave the skin greasy
* Absorbs quickly and can be used under makeup
* Offers good SPF 50 protection against UVA/UVB rays
* Many people with acne skin say that it does not cause pimples
The not so good:
* On very oily skin it can be a little shiny over the hours
* It is not super moisturizing (if you have dry skin, it may feel a little "light")
* Some people may be slightly irritated if they have very sensitive skin
Final opinion:
It is a highly recommended sunscreen if you have combination or oily skin and want something that does not cause acne. It is practical, cheap and reliable for day to day, but it is not the most "perfect" if you are looking for a totally dry finish or super hydration.
If you want, tell me your skin type (dry, oily or mixed) and I'll tell you if it's the best option for you or if there's an even better one.
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Reviewed in the United States on May 16, 2026
★★★★★ 5
Matte, weightless, mildly drying
Size: 3 Fl Oz (Pack of 1), Style: SPF 50, Size: 3 Fl Oz (Pack of 1), Style: SPF 50
Very good sunscreen. It is very similar to the Neutrogena Ultra Sheer sunscreen but with less/minimal fragrance. It absorbs immediately and feels matte and invisible. The only slight downside is that the silica in the sunscreen is actually so good at absorbing oil that it is mildly drying. This is great for people with oily skin, but people with acne like myself often use retinoids that are already very drying, and this can magnify the dryness. I often follow this sunscreen with some moisturizer to counteract the drying effect.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 2, 2026
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