I was thinking about getting a 95 SSEi, but I'm having trouble locating places to buy mods. Which companies make headers, exhaust, supercharger pulleys? Any help would be appreciated. Also what are your best ET'*? Anyone? One more thing, do you guys think a 95 SSEi with 130k is still going to be reliable? THis car'* in really good shape but I can't help thinking of those miles.

Series 1 performance stuff look here:
http://bonnevilleclub.com/forum/viewtopic.php?t=22691
As far as exhaust, to the extent of my knowleges no one makes headers or any kind of exhaust kit.
You can get smaller pulleys from a few sources, check the Vendor'* Forum.
If you've maintained some sort of maintainance schedule you should be fine with that many miles, but it'* hard to gauge if it will stay that way with the extra power.
My bet is the car will handle it just fine.