Had this kit on my 2013 gt premium before buying my Shelby. Looks it was awesome, got repeated looks and compliments everywhere I went.
negatives very pricey to prep, paint and install cost me 1700 dollars...
the sound is great, however after a while when the excitement wears off the sound is pulsating inside. Forget conversations and expect headaches from time to time it was that bad.
for my Shelby I bought the same kit minus the side exhaust cut out as the kit itself is sweet. I have a full American racing exhaust on my Shelby with boss 302 cut outs with a switch under the dash. When I want the extra sound just pop the switch otherwise sound is perfect.