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Description
Holley HP EFI ECU and Harness Kits 550-602HP ECU AND HARNESS LS1 & LS6 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! Stop reflashing your factory ECU every time you make a performance modification. Get Holley EFI today!
HP ECU AND HARNESS LS1 & LS6Looking 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! Stop re–flashing your factory ECU every time you make a performance modification. Get Holley EFI today!
Features:
- Simple Installation - Plug and Play control of GM LS1/LS6 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 and and Bosch wideband 02 sensor designed to be used with GM LS1/LS6 engines with factory GM coils and a 24 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" touchscreen 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
-
Univesal
Specs
| Brand | Holley EFI |
|---|---|
| Crank Reluctor | 24x |
| Emission Code | 4 |
| Ignition Type | GM LS 24x |
| Injector Connector | Jetronic / Minitimer (Bosch) |
| Product Type | HP EFI Kit |
| Part Number | 550-602 |
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
4.2 ★★★★★
Based on 14 reviews
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Product Reviews
★★★★★ 5
Cutest shoes
Size: 8, Color: Burgundy
My daughter were these for prom and they were so cute and comfortable enough to wear all night. It’s great to be able to switch out the straps for different looks.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on July 19, 2022
★★★★★ 5
Perfect
Size: 9, Color: Black
These are my second pair of heels from Allegra K, I originally got the nude pair, and after wearing those all night I had to buy a black pair! I don’t use heels so these were comfortable enough to last me all night while still looking nice instead of using flats!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on October 25, 2021
★★★★★ 5
Stop looking! You found them!
Size: 11, Color: Black, Size: 11, Color: Black
Love love love these shoes. I am veryyy pregnant and heavy (as you can see in the pic). I used them for a wedding (all day long) and they were so comfortable (and I am not used to wearing heels). The size was perfect. I recommend them.
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Reviewed in the United States on February 25, 2021
★★★★★ 1
CHEAPLY MADE!
Size: 10, Color: Beige
These are very cheaply made, and they look like it. The ties don’t even have hymned/sown sides.
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Reviewed in the United States on February 21, 2025
★★★★★ 5
SMALL STRETCH STUNNING BRACELET
Color: GOLD METAL
I wear the silver one every day and even in shower never take it off and LOVE it - just purchased two gold bracelets for graduation gifts !! they are beautiful on
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Reviewed in the United States on May 16, 2026