Read towards the end of the dealer instructions sheet. It might explain why some of those running hard on the track are not getting the 'idle'. I've heard so many Ford videos of the idle during the production process, and the sounds weren't really the same. Some of those were released before...
In the Mustang forums I read, of those who have purchased the retail version of TracKey, by far, most are happy with their purchase. It may not have met the big expectations of some of the buyers, but they are still happy with it than not.
I posted this in the wrong forum (I've since posted in the Ford area)
About the idle - the lopey idle changes once you start hammering the car. Apparently the computer has to "learn" the driver, and the harder one drives it the more pronounced the lopey idle. There is now more immediate...
Maybe not the exact oil that is mentioned in the TSB, but is there by chance a different kind of oil that Ricardo would recommend that has the same effect?
Obviously I'm not a mechanic, but would this technique help cold shifting in the GT?
http://mustangsdaily.com/blog/wp-content/uploads/2011/03/tsb-11-03-18.pdf