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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
4.7 ★★★★★
Based on 24 reviews
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Product Reviews
★★★★★ 4
GOOD BALL
Size: 6 Inch Diameter, Color: Apple Green
This is my second time buying this ball for my blue heeler, and it is easily his favorite toy. It is very sturdy, especially for hard-playing dogs, and handles rough outdoor play sessions effortlessly.
The design is brilliant because it does not go flat, yet my dog is still able to bite it and get a good grip on it. It’s the perfect combination of being tough but still flexible enough for a dog to enjoy carrying around. For comparison, our first ball finally stayed flat after a solid 2 months of non-stop, hardcore playing, which is a massive win compared to other toys he destroys in minutes.
If you have an active, high-energy dog that loves to play rough, this ball is highly recommended!
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Reviewed in the United States on June 9, 2026
★★★★★ 5
Best Ball ever! Aussie is obsessed
Size: 6 Inch Diameter, Color: Orange
I will never buy any other ball!!!! I bought the 8 inch which my crazy Aussie liked. The 6 inch one he won't stop carrying it around. his face use to be so sad when he would pop other balls. This one deflates and fills back up instantly! He chases it and chews on it. We gone through a lot of balls, but this is going to be a staple in our house!
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Reviewed in the United States on June 5, 2026
★★★★★ 5
Great for crazy pups!
Size: 8 Inch Diameter, Color: Ocean Blue
Tough and fun! This is a great toy to keep in the yard for play. I have a heavy chewer. He can get a hold of it and carry it around but it doesn't pop. It is soft enough but also strong. My dog loves to herd it around. He loves it!
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Reviewed in the United States on May 19, 2026
★★★★★ 4
Durable, bouncy fetch toy that dogs usually love
Size: 8 Inch Diameter, Color: Ocean Blue
Bouncing Dog Toy is generally very well received, especially for dogs that enjoy fetch and active play. It is made from a flexible, puncture resistant material that can handle a lot of biting and chewing without immediately popping or losing shape. Many owners like that it has a good bounce and is easy for dogs to grip, even when wet or slobbery. It is also lightweight enough for kicking, tossing, or rolling, which makes it great for interactive play sessions.
A big highlight is that it floats, so it works well for water play as well as backyard or park fetch. The 8 inch size is especially good for medium to large dogs because it is big enough to avoid accidental swallowing but still easy for them to carry and chase. Most complaints are pretty typical for any dog toy of this type, meaning very strong chewers can eventually damage it, and some dogs may puncture it over time, but even then it often keeps its shape and continues to be usable
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Reviewed in the United States on May 4, 2026
★★★★★ 5
Soccer ball just for dogs
Size: 6 Inch Diameter, Color: Ocean Blue
I could say "soccer", and our shoodle would wag her tail ready to play soccer with a tennis ball so I tried out this real soccer ball with her. Mostly, she just wants to wait for me to kick it, playing defense, so she can chase it like the tennis ball. After that she wants to usually bite it or roll over on top of it as a way to secure the ball, but sometimes she will have fun pushing it around with her nose or paws. She still prefers the frisbee for play time outside since the frisbee is good for catching and for playing tug-o-war, but this is a good alternative that always gets her wagging with excitement.
I wanted to get a regular 6" soccer ball for our shoodle, but this was a good choice for dogs for the durability and safety of the rubber material. The hexagons give the dog some grip to pick it up. The rubber is soft enough to grip and expel air when they do figure out how to grip it. The ball is designed to suck back in air when the dog releases the ball.
- Durable rubber material ideal for dogs
- Dog can squeeze out air to grip it
- Ball fills back up with air after air is squeezed out
- Can make more noise than a leather soccer ball
- Noise is still tolerable when used indoors
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 29, 2026
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