I would not take the shop's word for the HP Tune. Before you for the money over for the tune, make sure you email the guys at HP Tune, you can do it through their site
http://www.hptuners.com/contact.php
They respond very quickly, I checked with them 1.5 weeks ago, and the guy said he DID NOT support V6 yet. I almost was fooled by a shop here, I then decided to go with Trifecta, its more fun that way I think.