What type of mod you looking for?...performance, appearance, sound, comfort?
I've done a ton to my car..and well want to do a ton more. A lot of mine were preventative maintenance on of parts that didn't need it but I wanted to. However for me in the 4 categories above I liked the following. I don't race or track.
Performance - Surprisingly it was the least likely thing I would have planned to do...replaced control arms and drop links, I honestly thought it would be a big waste of money but I simply cannot drive the car enough now, the handling is amazing. I also liked the switch to 18'' wheels from 17s.
Appearance - This is a tough one, I'd probably say putting 2006 wheels with spacers on my 2000. Though painted bumperettes, new tail lights, restoring the seats, and of course making the paint like new didn't hurt
. Oh and the P O R S C H E on trunk.
Sound - desnorkled, though I would like a cool exhaust.
Comfort - replacing the too smooth shiny steering wheel with a new one, much safer. I'm still looking for a good buy on some 997/987 sport seats, I've been in them for hours in a Cayman and the difference to mine is night and day...the question is do i want to spend the money.