Number3 I have the 07 spec bike got it 1st of March and was afrade to do any mods to it! I got a bit fed up with the surging so I up,d the CO by 10 and stuck with it as it smoothed out a lot but was still a bit of a hand full in 2nd and 3rd gear so off came the seat to find the air box snorcle and off with that too!!! What a huge differance!! GET THE SNORCLE OFF!!