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Ships within 48 hours · Estimated delivery Jul 8 - Jul 13
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Description
Holley HP EFI ECU & Harness Kit (HO550-603)HP EFI ECU WITH HARNESS Suit LS2 LS3 LS7 (58x Tooth Crank Sensor) Part Number: HO550 603 Looking for a plug and playkit for your GM LS engine? TheHP ECU allows you to accurately control the fuel and ignition of your engine plus much more. Got a stock LSengine? Simply download a basemap 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
HP EFI ECU WITH HARNESS
Suit LS2/LS3/LS7 (58x Tooth Crank Sensor)
Part Number: HO550-603
Looking for a plug and playkit for your GM LS engine? TheHP ECU allows you to accurately control the fuel and ignition of your engine plus much more. Got a stock LSengine? Simply download a basemap 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 harnessinto your factory sensors, wire the power and grounds andyou are ready to take completecontrol 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 inno 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
- ECUis fully potted and can be mounted in the engine compartment or interior
- Sealed automotive and marine grade connectors
- 1-5 Bar MAPsensor capability
- Optional plug and play hand-held programmer, 5.7" touch screen and digital gauges are available for ultimate controland vehicle monitoring
- ECU is certified to ISO 8846, SAE J1171 & United States Coast Guard Requirements for Ignition Protection & Fire Resistance
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
4.8 ★★★★★
Based on 2305 reviews
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Product Reviews
★★★★★ 1
Size not as expected
Size: 11.5, Color: Grey
Ordered same size as I always do. Way too large. Size listed was off by a long shot
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Reviewed in the United States on May 22, 2026
★★★★★ 4
Lightweight and True to Size — Best for Casual Use
Size: 9.5, Color: Navy, Size: 9.5, Color: Navy
It is nice to see the Amazon Essentials brand expand from household essentials to apparel and shoes.
I ordered the Amazon Essentials Men's Lightweight Knit Running Sneakers. The product is made in Vietnam and comes in a shoe box, which is nice. I've noticed that quite often, inexpensive shoes are delivered just in a plastic bag. The sneakers are ready to use and have no odors from glue, organic solvents, etc., which is common nowadays.
I wear a size 9W or 9.5. These sneakers are 9.5 and feel like a typical 9.5 size, without surprises. The product is advertised as lightweight, and it is true. Each shoe weighs below 0.6 lb (265 grams). Inside is soft memory foam; the shoes sit on the foot well, snug enough and comfortable, and are easy to put on and take off.
They seem like a good fit for spring and summer as casual footwear or for light gym use. The sole is simple and not designed for performance or high-impact activities. Overall, a solid, reasonably priced, comfortable everyday option, though not intended for serious running or training.
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Reviewed in the United States on April 15, 2026
★★★★★ 5
Budget buy while being as comfy and stylish as an expensive brand!
Size: 9.5, Color: Navy, Size: 9.5, Color: Navy
My 14 year old had been running his own business since he was 12. He does lawn care and snow removal. His go to shoes when it's too hot for his work boots has always been off brand hey d*de style ones which are terrible for that kind of work as they just don't have the ankle support.
He's also had some Orthopedic arch supports custom made for him through the DR in the last year that he needs to use in whatever shoes he's wearing at the time. So I've been on the search for a simple pair of slip on shoes that he could wear while working long hours around our community.
He's sent me this picture tonight before heading out. He said "I didn't feel like putting my arch supports in and these are so comfy that I don't even notice I don't have them!"
They are sharp looking shoes that really stand out as of they were A high end pair! It's great that they can be an every day style or could be more of a sport shoe as they have the support and padding for both options.
In our case they likely be green with in a day or two and it'll be interesting to see how well they wipe off between his work days. I can update this review once he's worn them a bit more.
For now they have been perfect for versatility, size was true to size (I did order 1/2 size up, but only did that because he's growing so fast!) and they are definitely a great fit to a budget!!!!
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Reviewed in the United States on May 8, 2026
★★★★★ 5
Good purchase.
Size: Medium, Color: Black, Size: Medium, Color: Black
My daughter needed some black sweaters for work at Starbucks. Came across these and snatched one. Price was really good, it is soft, black color is vivid and did not fade after washing. Durable and well-made. Fits as expected...she wanted something loose on her to wear on cold nights over her shirt. Keeps her warm. It came pretty quickly. The material is soft and its comfortable to wear. Nice basic sweatshirt to have in your closet! Pleased with purchase 😊 hopefully this helps!!
Oh we intentionally bought bigger for an oversized fit.
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Reviewed in the United States on January 9, 2026
★★★★★ 5
Wears well. True to size. Great quality.
Size: Medium, Color: Duffle Bag Green
Excellent weight and a phenomenal price. Quality is exceptional. Hubby says it's comfy. Fits true to size.
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Reviewed in the United States on May 15, 2026
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