I had my 2011 GT for a week now. I just installed a magnaflow catback street series exhaust, steeda cai, and an sct x3 tuner with a custom evolution tune. This really woke the car up, night and day difference from the stock car! I definitly recomend these mods. And Evolution did a great job! I put my order in monday night on line and had my parts thursday and I installed them thursday night!