Hellcat and GT will not be competing with each other. The question to ask is will the Shelby beat the Hellcat. And If I had to guess I would say it will out handle the Hellcat at least, might not quite beat it in a straight line. It will be interesting to see what they do with the Shelby in response for sure though.
Recent 1/4 mile testing....
"The Hellcat just completed its first quarter mile, and the results are in: 10.8 seconds on drag radials, and 11.2 seconds with the factory tires
. These times are NHRA-approved. Dodge now officially sells the fastest muscle car ever created, since the closest competition from Ford, the Shelby GT500, runs the quarter mile in 11.6 seconds
, and the Chevrolet Camaro ZL1 has to make-do with 12.1 seconds
. Dodge Challenger Hellcat: Quickest Muscle Car in the Quarter Mile - News - 2015 Dodge Challenger - The Car Guide
2013 Mustang GT Premium Convertible
Candy Apple Red, Auto, FRPP Tune, GT500 Axlebacks, KONI Yellow Sport (adjustable dampers), FRPP Front and Rear swaybars, Custom Removable 4 Point Roll-Bar, BOSS 302 Low Expansion Brake Lines, Roush side splitters, GT500 spoiler, Redline Tuning hood struts,18" Ford Chromed Aluminum Wheels (9R3Z-1K007-A), Michelin Pilot Super Sports - 235X50X18
2011 Mustang V6 Premium Convertible - Gone