Went ahead and joined the band wagon with this one. Got the OBD2 bluetooth adapter on Ebay for 20 bucks and bought the app for 4.95.
Got to say I am impressed even though I have no clue what to do lol
I got the guages all set up and did some data logging.
My truck makes 611hp and 1065tq!
Even if you dont know all the techinacal terms with the cars ECM etc etc. The app is very easy to understand and figure out what your doing.
Basically bought it to have a cheap but advance scanner since I and a buddy work on alot of cars on the side.