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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
4.6 ★★★★★
Based on 8 reviews
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Product Reviews
★★★★★ 5
Favorite toy so far!
Color: Purple, Size: Medium (Pack of 1)
I got the medium for my approx 25 lbs border collie mix 4.5 month old puppy. He is in love! He still has his razor baby teeth and didn't do any damage to it the first two uses. A great *quiet* toy to keep him busy. I am putting the replacement rings on autoship now!
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Reviewed in the United States on September 24, 2022
★★★★★ 1
1st out of 9 purchases to be broken in a few hours
Color: Purple, Size: Medium (Pack of 1), Color: Purple, Size: Medium (Pack of 1)
I have bought 9 of the PetSafe ring toys. 5 for my pup and 4 as gifts. I have all of the toys (chicken, steak, jack, corn, ball, bone, nobbly). Never have I ever experienced any of them being broken in 1 afternoon. I will be asking for a replacement. But on the positive note, he was exhausted after finally getting the rings off. He has never broken any of the previous toys.
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Reviewed in the United States on June 5, 2026
★★★★★ 5
Best toy I've found in a long time!
Color: Purple, Size: Medium (Pack of 1)
I got the small Nobbly for my 3lb puppy, but it's too big for her (she loves the xs bouncy ball one anyway). So my 15yo standard poodle adopted it and loves it. It's really too small for him so I watch him and don't leave him unattended. He is so old with bad teeth, and the softness of the center is great for him. It is totally cleaning his teeth, I see white where I haven't for years. But ZERO bleeding which is awesome. It's easy for him to hold and difficult for him to get to the rings, they last plenty long. I will order this one for him in a larger size, probably the medium. 100% satisfied with these toys! Ps I also have a hard chewing 12yo aussie that breaks teeth on anything like a bone. He gets thru the rings in minutes with the bouncy ball and nobbly, but takes way longer with the jack shaped one. He also likes to chew the purple ends of the jack, not just the rings. But I don't think they're hard enough to break his teeth. All of my dogs are different style chewers, but there is a good variety of designs so you can find the perfect one for your canine friend!
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Reviewed in the United States on October 28, 2017
★★★★★ 3
Dog loved it
Color: Purple, Size: Medium (Pack of 1)
These products keep the dogs entertained but this particular model my dogs easily unscrewed!
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Reviewed in the United States on December 31, 2024
★★★★★ 5
Dog-approved toy!
This dog toy was initially confusing because the instructions did not say or show where to find the power button and charging port. They were nowhere to be found until I realized I could unscrew the bottom part of the ball from the top (see picture). That revealed the button and port -- problem solved. Then on to the dog test. Our dog was initially confused by and ultimately fascinated with the ball as seen in the video. There are several operating modes depending on how active your dog is/wants to be. The toy seems quite rugged, so immune to rough dogplay, at least from a golden retriever. Our dog considers this a hit!
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Reviewed in the United States on May 28, 2026