Holley EFI Terminator X-Max MPFI System with Transmission Control — Fits GM LS Engines

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SKU: GVMR_550-920
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Sale price$1,708.95 Regular price$1,899.95
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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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Master Your Engine Performance with Holley EFI Terminator X-Max

The Holley EFI Terminator X-Max MPFI System is the ultimate engine management solution for enthusiasts looking to modernize their GM LS platform. Designed for high-performance street and track applications, this system provides full control over your engine's fuel and ignition timing, while uniquely integrating transmission control for popular 4L60E and 4L80E automatic transmissions.

Key Features and Benefits

  • Integrated Trans Control: Seamlessly manage your 4L60E or 4L80E transmission shifting and torque converter lockup.
  • 3.5-inch Touchscreen: Includes a high-resolution handheld display for easy tuning, data logging, and real-time monitoring of vital engine vitals.
  • Plug-and-Play Harness: Simplified installation with factory-style connectors, reducing wiring complexity for a cleaner engine bay.
  • Self-Tuning Capabilities: Advanced software automatically adjusts your fuel map, allowing for a smooth idle and crisp throttle response without needing a professional dyno tune immediately.
  • Expandability: Easily add sensors, nitrous control, or boost management as your build evolves.

Whether you are performing an LS swap or upgrading an existing fuel-injected setup, this system provides the reliability and precision required for modern performance. Experience superior driveability and power delivery with the industry-leading technology found in every Holley EFI kit. Find all your high-performance engine management needs 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

Master Your Engine Performance with Holley EFI Terminator X-Max

The Holley EFI Terminator X-Max MPFI System is the ultimate engine management solution for enthusiasts looking to modernize their GM LS platform. Designed for high-performance street and track applications, this system provides full control over your engine's fuel and ignition timing, while uniquely integrating transmission control for popular 4L60E and 4L80E automatic transmissions.

Key Features and Benefits

  • Integrated Trans Control: Seamlessly manage your 4L60E or 4L80E transmission shifting and torque converter lockup.
  • 3.5-inch Touchscreen: Includes a high-resolution handheld display for easy tuning, data logging, and real-time monitoring of vital engine vitals.
  • Plug-and-Play Harness: Simplified installation with factory-style connectors, reducing wiring complexity for a cleaner engine bay.
  • Self-Tuning Capabilities: Advanced software automatically adjusts your fuel map, allowing for a smooth idle and crisp throttle response without needing a professional dyno tune immediately.
  • Expandability: Easily add sensors, nitrous control, or boost management as your build evolves.

Whether you are performing an LS swap or upgrading an existing fuel-injected setup, this system provides the reliability and precision required for modern performance. Experience superior driveability and power delivery with the industry-leading technology found in every Holley EFI kit. Find all your high-performance engine management needs 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

Master Your Engine Performance with Holley EFI Terminator X-Max

The Holley EFI Terminator X-Max MPFI System is the ultimate engine management solution for enthusiasts looking to modernize their GM LS platform. Designed for high-performance street and track applications, this system provides full control over your engine's fuel and ignition timing, while uniquely integrating transmission control for popular 4L60E and 4L80E automatic transmissions.

Key Features and Benefits

  • Integrated Trans Control: Seamlessly manage your 4L60E or 4L80E transmission shifting and torque converter lockup.
  • 3.5-inch Touchscreen: Includes a high-resolution handheld display for easy tuning, data logging, and real-time monitoring of vital engine vitals.
  • Plug-and-Play Harness: Simplified installation with factory-style connectors, reducing wiring complexity for a cleaner engine bay.
  • Self-Tuning Capabilities: Advanced software automatically adjusts your fuel map, allowing for a smooth idle and crisp throttle response without needing a professional dyno tune immediately.
  • Expandability: Easily add sensors, nitrous control, or boost management as your build evolves.

Whether you are performing an LS swap or upgrading an existing fuel-injected setup, this system provides the reliability and precision required for modern performance. Experience superior driveability and power delivery with the industry-leading technology found in every Holley EFI kit. Find all your high-performance engine management needs at GGCRACING.

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