Yes, you would amputate the bill from the rest of the underseat plastic. Note that the actual "duckbill" part is just the top area of the fender, not the large swoopy down plastic where the oem bilnkers and plate go. My understanding is the carbon fiber piece just sticks on over the plastic bill. I was going to cut the whole thing off too, but then I decided that I liked the look with the duckbill, it sort of looks to me like a mini dirtbike fender. I'm on the lookout for the stick on carbon part as well, but it turned out pretty nice in plastic with a Rizoma plate setup from Bic- thanks Bic!