Click on image to zoom

Holley Performance Avenger EFI Stealth Ram Fuel Injection System 550-821


Chevy Small Block V8 - Early To Late Heads - 36 lbs./hr. Fuel Injectors - Range Up To 500 hp - Satin

Pricing: $3,531.95


Holley Performance - Avenger EFI Stealth Ram Fuel Injection System P/N 550-821 Features:

  • Self-Tuning Fueling Strategy While You Drive
  • Requires No Laptop Computer To Set Up Or Tune
  • Includes Full Color LED Hand-Held Tuner
  • Offers Simple Setup And Easy Tuning
  • Dedicated Fuel And Oil Pressure Inputs

Product Documents:


Holley products have been the undisputed leader in fuel systems for over 100 years. Holley carburetors power every NASCAR Sprint Cup team and every NHRA Pro–Stock champion. Holley's products include performance fuel pumps, fuel injection, intake manifolds, cylinder heads & 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 Headers, NOS, Weiand, or Earl's, Holley products can give you the edge you need over the competition.


  • 550-821
  • 550-821
  • 090127667019
  • Holley Performance
  • New

Shipping Information

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

Customer Reviews

Comment Total Reviews (0)

Write the First Review!

You must login to post a review.