I just got an 04' ZX-10 and I'm wondering what all I can do to beef it up a little. I have a carbon Yoshi Tri-oval slip on and that's it so far. I've heard that if you're not racing then the PC III isn't worth getting. What are you guys thoughts on adding a PCIII USB, K&N filter, and -1 tooth on the front. If I get the PCIII, I'll get a custom map done here at one of the shops.