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Description
Holley HP EFI ECU and Harness Kits 550-602NHP ECU AND HARNESS, LS1 6, NTK 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, LS1/6, NTK
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 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 NTK wideband 02 sensor designed to be used with GM LS1/LS6 engines with factory GM coils and a 24 tooth crank sensor
- The NTK Oxygen Sensor is recommended when using leaded or methanol fuels, high exhaust temperatures 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" 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
- Universal
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 | 550-602N |
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
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Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
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4.7 ★★★★★
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Product Reviews
★★★★★ 5
Very good story!!!
Format: Kindle
I loved the characters and the storyline. Even a little mystery weaved in to the RH experience. The story made me laugh, cringe, hold my breath, and get sweaty. The love scenes were 🔥🔥🔥 🔥!!!! Great story to read!
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Reviewed in the United States on January 8, 2026
★★★★★ 4
So So Amazing
Format: Kindle
I received this book wiht the understanding that I could leave a voluntary and honest review.
In this book we meet June Wilder, Rhett Lawson, Cole Thibault, & Elias Nystrom. When this book opens we find that June has just joined the Atlanta Reapers as their new physical trainer. From the moment she starts she knows that she is going to get push back but there is something about not only this team but these guys that have become more to her than she thought when she first started. Rhett is the kind of guy who make a joke with anyone. One night when something happens with June he realizes there is something more than just jokes with her. Cole has been compartmentalized his life for years now. With the addition of June to the team he finds himself finding a person who understands his compartments and lets him be him. Elias is a man who is a an island. When he learns that opening up to one person who sees him allows him to grow and heal in many ways. Can they all find a HEA or will their positions make that impossible?
Another amazing story by this author. I would highly recommend it to anyone.
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Reviewed in the United States on December 31, 2025
★★★★★ 5
Good spicy campy hockey
Format: Kindle
I really enjoyed the character development. Reading about their growth and dealing with individual issues made good entertainment. Some surprising twists that made the book even better. Really glad we didn't have to go down the angst road where the public got to damage the budding relationships.
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Reviewed in the United States on January 1, 2026
★★★★★ 5
Great read!
Format: Kindle
Wonderful characters with great humor, a bit of mystery and a strong silent grumpy Sentinel to stand with the leading lady. They make her stronger but she also makes them stronger. I love the dynamics and the way it played out. This was a fun read!.
I received a free copy of this book via Booksprout and am voluntarily leaving a review.
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Reviewed in the United States on December 26, 2025
★★★★★ 5
June lives her life squarely in the NSFW zone...
Format: Kindle
June Wilder has embarked on the career of a lifetime-- the newest head physical trainer for NHL's Atlanta Reapers! She's relatively young for the position, not to mention female. In a male dominated sport, she's hoping to one day earn the trust and respect of the players, coaching staff and the organization. What she doesn't expect is to be an equal participant in flirty banter and NSFW activities in her office with handsome Right Wing Rhett Lawson. She quickly finds that Team Captain Cole Thibault is a confident and calming presence in her daily work activities-- and the man she goes on quite possibly the most perfect date with. Then there's Elias Nystrom, the Swedish Goalie who is quiet, HULKING in size, and downright frightens her-- with whom she shares a secret which could get her in hot water if discovered. Each of these team members intrigues her. Each she has a relationship with that is not entirely permitted as their head physical trainer. As she gets to know each of them better, she's falling deeper for each of them. Will she successfully navigate through the season without losing not only her job but her heart? What happens when each of the men find out about each other? Will she be asked to choose between them?
This book has everything I look for in a sinfully decadent read-- a strong, independent, and likable FMC; charming, protective, and sexy MMCs; a plot that is entertaining, well thought out and executes some unexpected twists; and has chemistry that explodes off of the pages. Once again author Cassie Cole has expertly achieved all of these things in her latest book "Hat Trick". I'm a big fan of the RH genre. Of all the authors I read, Cassie Cole is far and away my favorite to date. If you read this book, you will not be disappointed!
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Reviewed in the United States on December 1, 2025