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2 This is the 700-cfm Holley Avenger EFI throttle body sporting four 65 lb/hr injectors, which tucks neatly beneath most stock and aftermarket air cleaners and will mount on top of a Holley 1850/4150/4160 or Autolite 4100/4300 manifold pattern. It is also available in two 900-cfm sizes for up to 500 and 600 horsepower applications. What makes this throttle body work so well is time-proven GM electronic engine components you can purchase from any auto parts store. The fuel pressure regulator is located in back between pressure and return lines.