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[BlueBomber14]

the flies stay closed as you open the throttle till you reach a predetermined rpm level around 6000-7000 rpm I believe it was, then they begin to open and allow more air thru by removing them you allow the full flow of air requested from the opening of the throttle flies instantly and the addition of the custom map helps the fuel system keep up to pace with the new air flow numbers to achieve the 13:1 optimum fuel air mixture thru the entire power curve. with the flies in there is the equivalent of a vacum area between the secondary and primary flies when the throttle is opened fully under the 6-7 grand level this vacum obviously will restrict the power making ability of the engine. So it doesn't actually make more HP with the flies out it is just restricted from making the actuall HP it is capable of at lower rpms with the flies in. Removing the flies solves this problem.

That's my story and I'm sticking to it!!!!!!!!(even if it's wrong)