I'm assuming you have an auto' so I'd recommend a torque converter before anything else. You won't find a mod' that will net you as big a seat-of-the-pants feeling OR improvement at the track other than nitrous. Ultimately, the bigger stall converter you go, the better, however it will feel looser than stock, so depending on how you percieve it, will be good or bad in your eyes. I wrote up a quick thread on my website if you would like a little better explaination of a converter:
http://s2.excoboard.com/exco/thread....readid=1500521
Another site to look for some information on torque converters:
http://www.converter.cc/faq/faq_main.htm
My site is crappy but if you scroll down about four posts, you'll find my input.
As far as regular maintenance, I'd stick with what the dealer recommends. I don't know that I'd do a flush with the mileage on your car; I've read that many people think that the old fluid sometimes helps seal the small imperfections in the tranny and flushing new fluid in will sometimes wash away some of the old crud sealing everything together. I'd DEFINATELY change the filter and gasket and add the four quarts of ATF or so, but I personally won't flush my tranny.
These are just my opinions. I'm not trying to change your mind or tell you what to do. I do wish you the best of time at the track though and am sure you'll run great times.
