A PC is not really going to give you anymore peak power if your bike is stock but a good map can make the power you have much more usable. There are other things you can do like lightweight 520 chain and sprockets with lower gearing or a muffler but the PC is a great starting point if you plan to do anything else as it's the only way to optimise any engine mods.
I have actually put a bit of a list together of mods for horsepower-per-dollar comparison that I've been considering posting as a discussion thread. I may have to dig it out
do you have a full exhaust or just a bolt on can? if its a full system you want to add a PC3 and get it custom mapped. a good system you'll see some good improvement. When I added my Sato system I immediately felt a difference in power than with mapping I got another 6hp over the baseline (no idea what it was before the exhaust change though). So 6hp and extremely linear power delivery was well worth it.
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