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 The Holley Avenger 4-V TBI system bolts directly to the intake without the need for any adapters. The fuel inlet and outlet lines, as well as all of the wiring connections from the 2-V TBI unit plug directly into the 4-V unit. All you have to do is go back to the handheld controller and tell it what Avenger TBI unit you’re using. The 550-400 unit’s rated at 700 cfm and is capable of supporting 200-400 hp.