Purchase of a PCIII would be anything from a hundy to $700 odd, depending on it being second-hand to new.
Then it has to be fitted (which you could do yourself) and then you need a shop with a dyno to tune it. Only caveat in my opinion is that if you are going to do any other mods running wise, to do it all first, before getting the tune.
Other thing, with only a slip on, it shouldn't have really changed the bike that much, however, whatever model the yoshi is, have you checked the powercommander site for a slip on map for that model pipe? (In fact, I had a look, here's a link for all the maps for 04 10's
If you end up getting a custom tune, you will need to use a shop (AMPS, Henderson Motorcycles, Triple Zee Motorcycles), and personally, I would avoid Henderson (some say they have a penchant for being cowboys) and a mate has used Triple Zee, and had excellent results. I used Brett Roberts, but he does it part time. Cost would probably be a $200-$400.
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