I used one of these adaptors in my 2005 ZT:
http://www.ebay.co.uk/itm/1212731453...84.m1439.l2649
8 quid! Be warned however they are a real BEACH to set up...
After 3 hours commuting I finally got it going, had to delete all the other devices my phone has paired with in the past, had to use the "alternative ODB header" option, had to pair it before starting the app, then select it from the list of available adaptors within the app as letting it run as a default wouldnt work, had a whole load of trouble and was about to send it back as faulty...
...but then a chance stop at a petrol station had the answer... start Torque running BEFORE you get in the car! Success. If I do that it works a treat!
As for the app itself, Hawkins is a god damned sexual tyrannosaurus. Just like me