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Holley Performance 550-820 HP EFI Stealth Ram Fuel Injection System

4785409 - 550-820

Chevy Small Block V8 - Early To Late Heads - Range Up To 500 hp - Satin

550-820 HP EFI Stealth Ram Fuel Injection System Holley Performance

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Holley Performance - HP EFI Stealth Ram Fuel Injection System - Part#: 550-820 Features:

  • Boost Control - Boost Vs Time/Gear/Rpm/Speed Over-Boost Safety
  • Utilize A Laptop Or Hand Held Tuner
  • Self Tuning Capabilities
  • 4 Programmable Inputs/Outputs
  • 5.7 in. Color Touchscreen For On-The-Fly Tune/DataLog/Gauge Panel
  • Plug And Play Control Of Factory Engines
  • Internal Data-Logging Is Standard
  • 4 Stage Progressive Nitrous Control
  • Integrated Water/Methanol Injection Control
  • Advance Idle/Closed Loop/Enrichment Strategy For Stab

Product Documents:

View the Full List of Automotive Applications »

Below is an abbreviated list of applications for the HP EFI Stealth Ram Fuel Injection System.


Holley has been the undisputed leader in fuel systems for over 100 years. Holley carburetors have powered every NASCAR Sprint Cup team and nearly every NHRA Pro–Stock champion for four decades. Now, Holley EFI is dominating the performance world as well as our products for GM's LS engine. Holley's products also include performance fuel pumps, intake manifolds & engine dress–up products for street performance, race and marine applications. As a single solution, or partnered with products from other Holley companies - Hooker Headers, Flowtech Exhaust, NOS Nitrous, Weiand, Earl's Performance Plumbing, or Diablosport - Holley products can give you the edge you need over the competition.

Shipping Information

  • Item Requires Shipping
  • 45.0 lbs.
  • W20.0000” x H16.0000” x L32.0000”

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