At the very least an upgraded (190lph - 255lph) fuel pump. Accompanying this would need to be a boost gauge to make sure things are still in check. You could run it at stock boost (9-11psi) with no other mods, but any other things you do will help it work better. Free air flow filter, catback exhaust (downpipe if you want to turn the boost up). After 15psi, you'll want to look into injectors/Fuel control, intercooler pipes etc.
That's a good price if it hasn't been installed or anything yet, even if you wanted to ebay it you could make a few bucks. There are free mods, and basic tune up things that will help the car run it's best too.