Holley EFI HP ECU & Wiring Harness Kit — Fits GM LS2, LS3, LS7 Engines with 58x Reluctor

SKU: GVMR_550-603
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Car Wheel Size Chart

Wheel Diameter (inches) Tire Width (mm) Aspect Ratio Rim Width (inches)
14185655.5
15195606.0
16205556.5
17215507.0
18225457.5
19235408.0
20245358.5

Note: Wheel and tire sizes vary by car make and model. Always consult your vehicle’s manufacturer for exact specifications.

How to Read Tire Size

Example: 225/45R17 means:

  • 225 = Tire width in mm
  • 45 = Aspect ratio (height as % of width)
  • R17 = Rim diameter in inches

Product Details

Product Description
Part Numbers
Sizing & Fit

About Holley EFI

Holley EFI engineers high-quality automotive parts and accessories trusted by enthusiasts and shops across North America. At GGCRACING we stock the full Holley EFI lineup with fast shipping and expert fitment support — order with confidence.

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Maximize LS Power: Holley EFI HP ECU & Wiring Harness Kit for LS2/LS3/LS7 (58x Reluctor)

Unleash the full, modern potential of your GM LS2, LS3, or LS7 engine with this purpose-built Holley EFI HP ECU and Wiring Harness Kit. Specifically engineered for LS-series engines equipped with a 58x reluctor wheel, this comprehensive package provides a seamless and powerful upgrade to your engine management system. Experience improved throttle response, enhanced fuel efficiency, and significant horsepower gains, all while maintaining the legendary reliability of your LS platform.

Key Features & Performance Benefits:

  • Dedicated HP EFI Control: Benefit from Holley's advanced HP EFI technology, precisely managing fuel delivery and ignition timing for optimal power and efficiency in your LS engine.
  • Application-Specific Wiring Harness: Includes a meticulously crafted, pre-terminated wiring harness designed specifically for 58x reluctor LS2, LS3, and LS7 engines, ensuring a clean, reliable, and straightforward installation.
  • Self-Tuning Capabilities: Get your LS running perfectly with intelligent self-tuning algorithms that continuously adapt to your engine's specific needs, providing excellent drivability and consistent performance.
  • Broad Sensor Compatibility: Supports a wide range of common LS engine sensors, making integration with your existing setup simple and effective.

Precision Fitment for Modern LS Engines:

This Holley EFI HP ECU and Harness Kit is precisely engineered for GM LS-Series engines, including the popular LS2, LS3, and LS7 models that utilize a 58x reluctor wheel. It offers a direct-fit solution, eliminating the complexities often associated with aftermarket EFI conversions on these powerful platforms.

Technical Specifications:

  • ECU Type: Holley HP EFI Engine Control Module
  • Harness Configuration: Specific for GM LS2/LS3/LS7 (58x Reluctor)
  • Part Number: 550-603
  • Included Components: HP ECU, Main Wiring Harness, Installation Guide

Why Upgrade Your LS with Holley HP EFI?

Upgrading to the Holley EFI HP ECU & Wiring Harness Kit means unlocking the true potential of your LS2, LS3, or LS7. Enjoy superior engine control, improved drivability, and the confidence that comes with a robust, high-performance EFI system. It's the ultimate choice for enthusiasts seeking to maximize their modern LS engine's output. Find this and more at GGCRACING.

Product Details

Product Description
Part Numbers
Sizing & Fit

About Holley EFI

Holley EFI engineers high-quality automotive parts and accessories trusted by enthusiasts and shops across North America. At GGCRACING we stock the full Holley EFI lineup with fast shipping and expert fitment support — order with confidence.

Watch in action

Maximize LS Power: Holley EFI HP ECU & Wiring Harness Kit for LS2/LS3/LS7 (58x Reluctor)

Unleash the full, modern potential of your GM LS2, LS3, or LS7 engine with this purpose-built Holley EFI HP ECU and Wiring Harness Kit. Specifically engineered for LS-series engines equipped with a 58x reluctor wheel, this comprehensive package provides a seamless and powerful upgrade to your engine management system. Experience improved throttle response, enhanced fuel efficiency, and significant horsepower gains, all while maintaining the legendary reliability of your LS platform.

Key Features & Performance Benefits:

  • Dedicated HP EFI Control: Benefit from Holley's advanced HP EFI technology, precisely managing fuel delivery and ignition timing for optimal power and efficiency in your LS engine.
  • Application-Specific Wiring Harness: Includes a meticulously crafted, pre-terminated wiring harness designed specifically for 58x reluctor LS2, LS3, and LS7 engines, ensuring a clean, reliable, and straightforward installation.
  • Self-Tuning Capabilities: Get your LS running perfectly with intelligent self-tuning algorithms that continuously adapt to your engine's specific needs, providing excellent drivability and consistent performance.
  • Broad Sensor Compatibility: Supports a wide range of common LS engine sensors, making integration with your existing setup simple and effective.

Precision Fitment for Modern LS Engines:

This Holley EFI HP ECU and Harness Kit is precisely engineered for GM LS-Series engines, including the popular LS2, LS3, and LS7 models that utilize a 58x reluctor wheel. It offers a direct-fit solution, eliminating the complexities often associated with aftermarket EFI conversions on these powerful platforms.

Technical Specifications:

  • ECU Type: Holley HP EFI Engine Control Module
  • Harness Configuration: Specific for GM LS2/LS3/LS7 (58x Reluctor)
  • Part Number: 550-603
  • Included Components: HP ECU, Main Wiring Harness, Installation Guide

Why Upgrade Your LS with Holley HP EFI?

Upgrading to the Holley EFI HP ECU & Wiring Harness Kit means unlocking the true potential of your LS2, LS3, or LS7. Enjoy superior engine control, improved drivability, and the confidence that comes with a robust, high-performance EFI system. It's the ultimate choice for enthusiasts seeking to maximize their modern LS engine's output. Find this and more at GGCRACING.

Product Details

Product Description

About Holley EFI

Holley EFI engineers high-quality automotive parts and accessories trusted by enthusiasts and shops across North America. At GGCRACING we stock the full Holley EFI lineup with fast shipping and expert fitment support — order with confidence.

Watch in action

Maximize LS Power: Holley EFI HP ECU & Wiring Harness Kit for LS2/LS3/LS7 (58x Reluctor)

Unleash the full, modern potential of your GM LS2, LS3, or LS7 engine with this purpose-built Holley EFI HP ECU and Wiring Harness Kit. Specifically engineered for LS-series engines equipped with a 58x reluctor wheel, this comprehensive package provides a seamless and powerful upgrade to your engine management system. Experience improved throttle response, enhanced fuel efficiency, and significant horsepower gains, all while maintaining the legendary reliability of your LS platform.

Key Features & Performance Benefits:

  • Dedicated HP EFI Control: Benefit from Holley's advanced HP EFI technology, precisely managing fuel delivery and ignition timing for optimal power and efficiency in your LS engine.
  • Application-Specific Wiring Harness: Includes a meticulously crafted, pre-terminated wiring harness designed specifically for 58x reluctor LS2, LS3, and LS7 engines, ensuring a clean, reliable, and straightforward installation.
  • Self-Tuning Capabilities: Get your LS running perfectly with intelligent self-tuning algorithms that continuously adapt to your engine's specific needs, providing excellent drivability and consistent performance.
  • Broad Sensor Compatibility: Supports a wide range of common LS engine sensors, making integration with your existing setup simple and effective.

Precision Fitment for Modern LS Engines:

This Holley EFI HP ECU and Harness Kit is precisely engineered for GM LS-Series engines, including the popular LS2, LS3, and LS7 models that utilize a 58x reluctor wheel. It offers a direct-fit solution, eliminating the complexities often associated with aftermarket EFI conversions on these powerful platforms.

Technical Specifications:

  • ECU Type: Holley HP EFI Engine Control Module
  • Harness Configuration: Specific for GM LS2/LS3/LS7 (58x Reluctor)
  • Part Number: 550-603
  • Included Components: HP ECU, Main Wiring Harness, Installation Guide

Why Upgrade Your LS with Holley HP EFI?

Upgrading to the Holley EFI HP ECU & Wiring Harness Kit means unlocking the true potential of your LS2, LS3, or LS7. Enjoy superior engine control, improved drivability, and the confidence that comes with a robust, high-performance EFI system. It's the ultimate choice for enthusiasts seeking to maximize their modern LS engine's output. Find this and more at GGCRACING.

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