With the hose connected, the flap is closed below 2500rpm, open above 2500rpm. Taking it off will leave the flap open at all times, whether you plug the hose up or not. Since your powerband is well above 2500rpm, it really makes absolutely no difference, no matter what you do. Removing the flap doesn't do anything, since it has no flow resistance when open. Nothing to be gained there, IMO.