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Description
HP EFI ECU & Harness Kits - 550-607NOverview: 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 NTK wideband O2 sensor, designed to be used with GM LS2/LS3/LS7 engines with factory GM coils and a 58 tooth crank sensor
- The NTK Oxygen Sensor is recommended when using leaded or methanol fuels, high exhaust 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" 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
4.3 ★★★★★
Based on 24 reviews
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Product Reviews
★★★★★ 5
Comfy and cute
Size: 3X, Color: Black
Perfect length. I normally wear a plus size 2X but I wanted it to be looser fitting so I got a 3X and it’s the exact fit I was looking for. The length hides my apron belly. The fabric doesn’t stick to me. Materiel is nice and lightweight. Hasn’t wrinkled, dryer didn’t shrink it, super stretchy. Perfect for an active lifestyle
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 8, 2026
★★★★★ 3
Nice fit, but tank top materials feel hot
Size: Medium, Color: Dark Grey Heather
I bought the "dark grey heather" tank.
Pros:
-comfy relaxed fit (not snug or tight)
- armholes not too low
- i like the crewneck (but it sits a tiny bit high)
- shirt length is a good "normal" length (not short, and not too EXCESSIVELY long like other Amazon brand women's shirts in the past)
- looks casual and nice
- didn't shrink after machine wash and dry.
Cons:
- the WORST thing: material feels hot, and it's medium weight, not lightweight like the item description claims. Don't like the 6% ELASTANE, 38% MODAL in this fabric blend. Feels hot in humid hot Houston weather. (But I like the 56% pima cotton!)
- the "heathering" (maybe because of the materials) feels like tiny fabric fibers are itching me and not comfortable, especially if the air conditioner is not running,
- the hem has side slits and is slightly longer in the back than in the front.
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Reviewed in the United States on May 31, 2026
★★★★★ 5
Perfect fit and comfy
Size: Large, Color: Black
I love these shirts! They are soft and lightweight. They fit as they should. I have a black, periwinkle, dark green, and grey. Great tank for the money and perfect to exercise in.
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Reviewed in the United States on May 28, 2026
★★★★★ 5
Nice material
Size: Medium, Color: White
Soft . White is see though but other colors are nice and comfy for the summer. Reminds me of more upscale brands in terms of quality . Happy with this shirt
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Reviewed in the United States on May 22, 2026
★★★★★ 5
Quality and comfort!!
Size: Large, Color: Deep Green
Beautiful. Very pretty. You can wear this casually or to go out to dinner. The fit was very good. I recommend after washing let it air dry. I was afraid of shrinkage. I bought several, so I can mix and match. The downside with this outfit is it does snag. So be careful.
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Reviewed in the United States on April 5, 2026
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