$242 Off

Holley 550-603N HP EFI ECU & Harness Kit, LS2/LS3/LS7, NTK O2

$242 Off

Holley 550-603N HP EFI ECU & Harness Kit, LS2/LS3/LS7, NTK O2
Holley

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#425550603N

Holley 550-603N HP EFI ECU & Harness Kit, LS2/LS3/LS7, NTK O2

  • Has industry leading self tuning technology
  • It comes sealed with automotive and marine grade connectors
  • It provides significantly more functionality than OEM or other competitive ECUs
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$3,099.95

/each

Factory Shipped

$3,341.95

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Product Summary

Universal Fit, 58x Crank Reluctor, 4x Cam Trigger

  • Has industry leading self tuning technology
  • It comes sealed with automotive and marine grade connectors
  • It provides significantly more functionality than OEM or other competitive ECUs
  • The laptop programmable ECU includes a variety of base maps that will have you hitting the cruise or track in no time
  • Ideal for any motor ranging from stock 5.3L engine swaps or all out, 3,000 horsepower race cars that need a simple and powerful ECU and harness solution
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Key Specs

MFG. Part #550-603N
BrandHolley
Ignition TypeFactory GM
Injector ConnectorUSCAR (EV6)
Tuner StyleUSB/CAN Tuning Cable
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Holley 550-603N Details

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!

  • 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, USCAR (EV6 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!

Charts

CARB Warning

For race/ off road use only

Emissions warning: this part only legal for sale or use in California for racing (competition) vehicles which may never be used, registered, or licensed for use upon a public highway. Any other use renders the vehicle tampered and not legal for use on California public highways (any public street or roadway, public dirt road, public park, or publicly maintained right of way open to the use of the public for vehicular travel). Violations subject to $37,500 penalty per violation per vehicle, revocation of registration, loss of use on California public right of ways, and proof of correction for tampering. There are similar restrictions and penalties under federal law and the laws of all other states with penalties under federal law of up to approximately $45,268 per tampered vehicle and/or engine.
CARB warning

Holley 550-603N Specifications

KEY SPECS
MFG. Part #550-603N
BrandHolley
Ignition TypeFactory GM
Injector ConnectorUSCAR (EV6)
Tuner StyleUSB/CAN Tuning Cable
GENERAL
Crank Reluctor58x
Cam Trigger4x
MAP Sensor IncludedNo
Transmission ControlNo
Oxygen Sensor StyleNTK
GTIN Code090127687468
Sold in QuantityKit

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