| IMHO: There is only likely to be one 'gain' in junking the complete airbox and that is the weight saving. You are extremely unlikely to make any performance gains sticking filters in the end of the inlets. Most 'Classic Racers' dream of still air boxes/plenum chambers. Get it built properly and a 620 will do 65bhp with the air box (lid cut open and foam filtering place) fitted! |