Hi. Nice choice in cars For performance you might want to consider a one piece intake-Rabidchimp.com has a nice one. Also an LJM strut bar can make real difference in handling. There is a group purchase going on right now(I think) check this site for that. You can also make a rear strut bar for almost nothing and that helps too. The AFM mod is an easy way to improve throttle response a bit at no cost also.
For maintenance tips check out the FAQ here at Celicasupra.com.