look at the thread right below you
but yeah, I'll answer your Q.
Theoretically, yes, you can upgrade it to perform like a halfway-decent speedball gun. The only real problem remains size. The 98c is HUGE, relatively speaking, and also VERY heavy (still relatively), so snap-shooting is going to be much more difficult. You can get things like a double-trigger and an e-grip, and you would be just fine, but if you plan to get into it a little more seriously, I highly advise dropping the money for an Ion or Epiphany and an HPA tank and good Loader (Halo, Reloader, VLocity, Magna).