well heres a few suggestions.
a cobb accessport it controls the engines air fuel ratio ignition and ur boost, 695 dollars.
a turbo back exhaust, plus the upipe, 1200 dollars and lower, check ebay, got mine brand new, upipe down pipe mid with cat and muffler for 375.00
but first i would change all the fluids oil, radiator, diff fluids, and brake.
hope this helps.