i should add, that if your stock stuff is still in good shape then done worry about it unless you got money to burn. if you need new stuff then without a doubt go for it.. if even one of your stock sprockets are toast then go for the full set up. dont just change out one thing.
Installed a 520 on both my 1k and busa in the past (190 & 175 hp bikes). As long as you understand that you must keep it cleaned, oiled you should be ok. I changed my set every year and never had any problems.
I would not suggest a 520 conversion if you drag race on the street.