I put the BBK X pipe in my 13 GT. after debating for a long time, the big black friday sale was the decisive point. lol. But all I can tell you is that it went on so easy and I did not have any leaks. The car performed so much better than with the stock h pipe. I also have muffler eliminators and the X pipe actually made the sound a little deeper and much smoother at low RPMs, however after 4K RPMs it growls like a beast. Hope this help.