Cap all the "Track Key" does is give the PCM a little bit of an aggressive tune[450HP] and adjustable Launch Control, adjustable Pit Lane Speed Control Lopey idle that's it, the program for the key only became available in early august thanks to C.A.R.B lot's of PO'ed boss owners out there before that. A base GT stang have been dyno'ed at close to 600 hp and up.
As for putting and end to the warranty when you do bolt on stuff if you use Motorsport or Roush and it is dealer installed the warentee stays pretty much intact, it drops your powertrain from 5-50 to 1-12 depending on the MOD's that are done.
AS a note to any BOSS owners out there DO NOT do any mods not even a K&N filter, there is a message from FORD that if it has a mod you are SOL, so if you add a MOD put it back to stock if you blow it up before you take it back to the dealer for repairs, they will send an FSE out to check the car before it can be repaired. The days of supping up your Pony and keeping the warranty in Ford's eye's has gone the way of the dinosaur.
Sorry to the OP for sort of jacking his thread