This has been discussed to death: Transmission mount, COBB AP, Whoosh or Depo Racing I/C, panel filter. With what's left over you *might* be able to get a used set of lighter wheels (my favorite mod). Check the classified on this site - there's always good deals.
Anything that add noise isn't going to add performance, at least not with a stock turbo. Removing the stock exhaust resonator might scratch that itch cheaply.