| I think AK tried ram air several years ago without any real success.
As my 620 uses the same size airbox, throttle bodies and injectors as my 1000SS I doubt there is much that is holding back the performance once the airbox lid is opened up.
As Andy Pike says a Plenum chamber is one of the best ways to go so as to create a large reservoir of still air for the engine to be able to draw on, so long as that air can be replaced as quickly if not quicker than the engine uses it then it should be able provide the desired air/fuel ratio through out the rev range and not be effected by speed
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