The Cup is the muffler like thing that is your intake near the headlight. Over the winter I had posted the question Here and I had a few people interested in the bikes performance and sound. Well I have ridden it for a few weeks now and can say that once the moronic finally realized how I ride everything seemed to be back to about the same performance. Before that I thought I had really screwed up because everytime I twisted the throttle it fell on its nose about ready to die like it was too lean. So now about 2 weeks into riding it I realized that i had left it off when I noticed this strange noise coming from the front of the bike. The intake seems to be extremely Loud. It almost blocks out the stock exhaust. And when you get to really twisting the grip, she lets you know all about it. Definate plus for anyone who wants to hear the deep throaty intake. :yeah: Or for those of you who want to airhorn on the bike.