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Description
HP EFI ECU & Harness Kits - 550-603NOverview: 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, USCAR (EV6 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 | USCAR (EV6) |
| 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
4.9 ★★★★★
Based on 23 reviews
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Product Reviews
★★★★★ 5
Cost effective option to find what kind of toys you new small pup will enjoy.
Color: 12 PACK PUPPY TOYS
This was a great puppy toy assortment. It is great because it has different types so you can figure out what types of toys your new pup will enjoy. This package is only suitable for small dogs. Also, I do t think they would be good for aggressive cheers. But if you are looking for a cost effective bunch of small new puppy toys this is perfect.
There was no smell, the sound of squeaker were average high pitch, soft and moderately durable, design and appearance were generic. Not high quality but a good assortment. Not suitable for long term use IMO.
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Reviewed in the United States on December 8, 2025
★★★★★ 5
Love this and very durable!!
Color: Blue Spider
This spider is HUGE! It's sooooooooo nice! My 3 boys love it! They love chewing on all the legs and it's so big that they can all lay around it and each chew on a leg at the same time! They also play tug of war with it at times! It's stuffed with a cushiony material. It does not bounce. It's lightweight. Has no smell. It's so much fun for my boys! Love it! It has great durability as my one boy who literally destroys all his toys has not broken it and they've had it for 3 months so far! This alone speaks volumes! Highly recommend!
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Reviewed in the United States on March 26, 2026
★★★★★ 5
Dog toy
Color: Blue Octopus
Great dog toy very durable great 2 dogs to play tug of war
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Reviewed in the United States on June 9, 2026
★★★★★ 4
Aggressive chewer (terrier) approved!
Color: Blue Octopus
I would give five stars except for one small area. The back seam was too easy to access to get the squeaker out (literally under half an hour of him playing). ***BUT*** the legs are SO strong and can be used for tug of war and they are crinkly and he loves it.
Highly recommend!
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Reviewed in the United States on April 13, 2026
★★★★★ 3
Not bad, wish it was more durable
Color: Blue Octopus
My Australian Shepard loved this toy! However, it is NOT VERY DURABLE as advertised. He ripped off a leg within 20 minutes of getting the toy.
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Reviewed in the United States on June 6, 2026