Oh yeah, I almost forgot, another great mod is a SprintBooster. It doesn't add any power at all, but it remaps the throttle and improves throttle response. The biggest thing it does is that it seems to "wake" the car up. Personally, if I had no other mods, the SprintBooster would be it. I was very hesitant about spending $250 on an electronic gizmo that didn't add any power, but I'm very happy with the result. You can follow the SprintBooster link in my signature, or contact TVT Design. I believe he is a US reseller for SprintBoosters.

LASTLY:
DON"T FORGET TO CHECK THE FORUMS FOR GROUP BUYS! You can save a lot of money by going in on group buys.