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Description
HP EFI ECU & Harness Kits - 550-607Overview: 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, Jetronic/Minitimer (Bosch 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:
| Year | Make | Model | Submodel | Engine Size |
|---|---|---|---|---|
| Universal |
Specs:
| Brand | Holley EFI |
|---|---|
| Crank Reluctor | 58x |
| Emission Code | 4 |
| Ignition Type | GM LS 58x |
| Injector Connector | Jetronic / Minitimer (Bosch) |
| 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
4.2 ★★★★★
Based on 9 reviews
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Product Reviews
★★★★★ 5
Heavy-Duty, Reliable, and Perfect for Outdoor Use
Size: 50 FT, Style: 16/3 Extension Cord, Color: Black, Size: 50 FT, Style: 16/3 Extension Cord, Color: Black
I’m really impressed with this HUANCHAIN 50ft extension cord! The quality is excellent — it’s thick, durable, and clearly built to handle both indoor and outdoor use. The waterproof design is a huge plus, especially for powering outdoor lights, tools, or holiday decorations. It’s handled rain and damp conditions without any problems.
The 16/3 gauge wire provides a strong, steady connection, and the cord stays flexible even in cold weather — no stiff or tangled mess like cheaper cords. The 50-foot length gives me plenty of reach for yard projects, and the black color blends in nicely.
Overall, this is a well-made, dependable extension cord that feels like it’ll last for years. Great value for the price — I’d definitely buy HUANCHAIN again!
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Reviewed in the United States on November 5, 2025
★★★★★ 5
NICE CORD - GOOD PURCHASE
Size: 50 FT, Style: 16/3 Extension Cord, Color: Black
Purchased to use with an electric outdoor dusk to dawn light that needs to be plugged in but I needed an extension cord to reach the outlet. This worked perfectly. I also liked that the cord is very pliable. It would be easy to roll up if you just need an extension cord occasionally.
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Reviewed in the United States on June 2, 2026
★★★★★ 5
Great buy!
Size: 50 FT, Style: 16/3 Extension Cord, Color: Black
Exactly what I ordered. Sturdy and reliable cord. Definitely recommend! Great price!
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Reviewed in the United States on May 6, 2026
★★★★★ 5
Extension cord
Size: 50 FT, Style: 16/3 Extension Cord, Color: Black
Cheaply made but has strong plugends. I wish the insulation was like more like the heavy duty outside extension. Cords. This cord is still good especially for the price. The male and female ends are high grade plugs it looks like. Just wish they woulda placed a thicker outer insulation over the extension cord but it’s water proof and can be used outside it’s worth buy for long cord for the price
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Reviewed in the United States on May 2, 2026
★★★★★ 5
Good Product
Size: 50 FT, Style: 16/3 Extension Cord, Color: Black
I bought this for some Christmas decorations and it worked out well. I probably could have found a cheaper one in a store but it was convenient to buy it online and it arrived quickly. Great for outdoor use and I'm sure it will last a long time.
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Reviewed in the United States on May 1, 2026