| Hi Neil, both Phill and i agree on the difference between the 888 + 916 type airbox systems.If you manage to build a completely sealed air box, then there should be a performance gain, providing it is large enough.Witness the gains of the early 916 over the late 888's,but the box needs to be as large as possible,which is why the factory altered the frame on the 916 style racers,748r's and 996/8 bikes to allow a bigger box to be fitted.Then you would get into the realms of worrying about loosing airbox capacity with the fitment of a foam in the box type filter, but i still think the small loss of 1 or 2 bhp on a road bike is a price worth paying,the gains which i think are two fold.1 protection from airborne dust etc, 2 in the event of a get off and the tank coming away the foam should prevent anything large from entering the throttles, after all we aren't racing these bikes( well not in a race series). Steve |