I have my car back after 4 days at the dealer and I ended up with a bill for $209 dollars to repair it. When I installed the Pype-bomb muffler deletes shortly after purchasing the car I made small adjustments to the position of the pipes by loosening the bolts at the factory H-pipe and obviously the bolts behind the axle that hold the exhuast on.
Doing this caused the pipes over the axle to be just a little too close to the ABS/Advancetrac sensor wires for the right rear wheel and the wire would basically overheat and the car would lose the signal to the system and throw faults that they were able to read.
This was approximately the THIRD or FOURTH 2010-2011 Mustang they had seen with the exact same problem, all with aftermarket exhuast. The mechanic knew exactly the cause and repaired and re-routed the wire away from the exhaust for me so the problem would not return. I made VERY small adjustments to the location of the stock mid-pipe and was very surprised to see that I caused this issue.