karma8, you need to do your due diligence in order to inform yourself. First talk to or read up on the tunes available from Dinan, Vishnu, and Burger Motor Sports. Then, if you plan on having a shop do the install, research which shops in your area have done the tune you prefer. Try to talk to other cutomers of the local shop that got the same tune you are considering.
The Southwest's Premier Automotive Gathering.