Im new on here and I have a 2004 busa limited, hindle exhaust, k&n filter, and a tune done by the local dyno shop here in birmingham, al. The bike made 164 rwhp. This spring I got it out and had a little tire left so I drove a couple hundered miles to finish it off, well before I put a new tire on it the bike felt like it lost some power, My bike is lowered and it use to power willie in 1st gear and it stoped doing that and it felt slower well i figured it was spining, I go and put a new piliot tire on there and it still feels slower maby even slower well I checked the filter, plugs, every thing looked great so I said ill go to the track and see if I run the same times that I always have ran, well on the way to the track my friend has a 2006 gsxr 1000 and he wanted to play on the interstate and I BARLEY pulled away from him his is completely stock so i knew something was wrong, I go to the track and last year i was running 6.40s to 6.50s this time the best time i got was like a 6.80 and then a 6.78, does anybody know what could be wrong with my bike? I had a guy tell me that a stock computer will only hold a tune for so long, and thats whats wrong with it, does he know what hes talking about? and help would be great. My friend said my bike was smoking a little when I reved it up, thanks for any info