at redline does the 2008 GT500 SHUT DOWN?
Sounds like a crank sensor malfunction or a sensor grounding problem, does the check engine light come on when this happens? It might be worth your time to get the codes pulled.
No lights just brief pause then backfire
no lights or codes runs strong brief pause then backfire?
That tells me that there is an interruption in the ignition system, still might be worth checking the codes. If nothing is there you can start checking for loose connections and bad grounds. Or you can take it to a dealer to see if there is a software update.
Looking for a Used Shelby GT500 in your area?
CarGurus has 530 nationwide Shelby GT500 listings starting at $21,994.
Search Ford Shelby GT500 Questions
Ford Shelby GT500 Experts