Have a serious read through the following thread:
http://forums.nasioc.com/forums/showthread.php?t=1486051
I owned a 99 RS for 8 years. You'll also find out what I'm doing here in that thread.
They are great cars with lots of fun OEM things you can get for them, motorized folding mirrors, outside temperature display, compass, barometer (not a typo), rear fog lights, headlight washers,
intercooler sprayers. Not to mention heated seat plug right in, along with JDM clusters with the tach in the middle.
Or you could just drive it as is and still have equal amounts of fun. Just one comment, the rattles never stop.