I have a 1200 HP GT500 and had to take the ATAK mufflers off because the car was just too loud. I LOVE LOVE LOVE the sound of them.....my neighbors do not sadly. I really would like to trade for either the Borla Touring (preferred) or the Borla S type for a 2011+ GT500. The mufflers are in like-new shape and I will send pictures when requested. Will ship out the day I receive acknowledgement of a deal.