Holley EFI 550-501 HP EFI Universal MPI Retrofit Kits
Holley EFI 550-501 HP EFI Universal MPI Retrofit Kits
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Holley EFI 550-501 HP EFI Universal MPI Retrofit Kits

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Key item features

  • Advanced Software: Features new V2 software with Quick Start ignition/fueling for LSx engines, a data logger with scalable axes, and a real-time strip chart viewer.
  • Integrated Controls: Includes integrated boost control with multiple strategies (time, gear, RPM, speed) and 4-stage progressive nitrous control.
  • Traction Management: Offers traction control with power reduction via timing, nitrous percentage, or boost (requires Davis Technologies Holley Module).
  • Flexible Fueling: Supports Quick Start fueling for all engines, an option for VE-based fueling strategy, and fuel map/learn function smoothing.
  • Universal Compatibility: Designed for universal MPI retrofit on V-8 intake manifolds, including Mopar and Ford, with injector bungs and un-machined fuel rails.
  • Powerful Injector Drivers: Equipped with eight sequentially driven 8:2 peak and hold injector drivers, capable of driving up to 16 low or high impedance injectors.
  • Robust Ignition: Features eight-channel Distributorless Ignition (DIS) outputs for direct control of smart ignition coils or Holley DIS coils.
  • Onboard Diagnostics: Includes integrated single-channel wideband oxygen sensor control and internal data-logging with 2GB of memory.
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Columbus, 43215
Arrives by Fri, Feb 20
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Sold and shipped by SuperShops
4.4071428571428575 stars out of 5, based on 280 seller reviews(4.4)
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Comparison Chart:
Vehicle makeMoparHolley EFI 550-501 HP EFI Universal MPI Retrofit KitsGMHolley EFI 558-502 Fuel Injection HarnessFordHolley EFI 550-1507 Terminator X Max Ford Coyote - 2011-2012 w/ Ti-VCTFordHolley EFI 550-1006 Terminator X Stealth 4150, Gold-Holley EFI 550-942 Terminator X Max Universal MPFI Kit w/ Transmission ControlFordHolley EFI 550-443 Fuel Injection Throttle BodyGMHolley EFI 550-1621 Holley EFI Terminator X Max GM Gen V LT Late Direct Injection KitFordHolley EFI 550-616 HP EFI ECU & Harness Kits
Fuel injection accessory & part typeMPI Retrofit KitsHolley EFI 550-501 HP EFI Universal MPI Retrofit KitsFuel Injection HarnessHolley EFI 558-502 Fuel Injection Harness-Holley EFI 550-1507 Terminator X Max Ford Coyote - 2011-2012 w/ Ti-VCTFuel InjectorsHolley EFI 550-1006 Terminator X Stealth 4150, Gold-Holley EFI 550-942 Terminator X Max Universal MPFI Kit w/ Transmission ControlThrottle BodyHolley EFI 550-443 Fuel Injection Throttle BodyFuel Injection KitHolley EFI 550-1621 Holley EFI Terminator X Max GM Gen V LT Late Direct Injection KitInjector HarnessHolley EFI 550-616 HP EFI ECU & Harness Kits
Automotive parts divisionPerformanceHolley EFI 550-501 HP EFI Universal MPI Retrofit KitsPerformanceHolley EFI 558-502 Fuel Injection HarnessPerformanceHolley EFI 550-1507 Terminator X Max Ford Coyote - 2011-2012 w/ Ti-VCTPerformanceHolley EFI 550-1006 Terminator X Stealth 4150, GoldPerformanceHolley EFI 550-942 Terminator X Max Universal MPFI Kit w/ Transmission ControlPerformanceHolley EFI 550-443 Fuel Injection Throttle BodyPerformanceHolley EFI 550-1621 Holley EFI Terminator X Max GM Gen V LT Late Direct Injection KitPerformanceHolley EFI 550-616 HP EFI ECU & Harness Kits
Vehicle fitment typeSpecificHolley EFI 550-501 HP EFI Universal MPI Retrofit KitsSpecificHolley EFI 558-502 Fuel Injection HarnessSpecificHolley EFI 550-1507 Terminator X Max Ford Coyote - 2011-2012 w/ Ti-VCTUniversalHolley EFI 550-1006 Terminator X Stealth 4150, GoldSpecificHolley EFI 550-942 Terminator X Max Universal MPFI Kit w/ Transmission ControlSpecificHolley EFI 550-443 Fuel Injection Throttle BodySpecificHolley EFI 550-1621 Holley EFI Terminator X Max GM Gen V LT Late Direct Injection KitSpecificHolley EFI 550-616 HP EFI ECU & Harness Kits
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