My contribution to this thread:

1. If its less then 10k and its a TT its not worth it. you will pay more to fix it then its worth.
2. Trust Harry(Z tuner) he knows his stuff.
3. Don't run open exhaust unless you like huffing gas
4a. Adrian is right about the year/ EPA stuff
4b. Adrian forefits the right to speak z32 tech untill he gets his car back