This Catted X-Pipe is designed to be a direct bolt-on for the 2011-2014 GT-500 Mustangs with stock factory manifolds installed. This X-pipe is 3" Stainless steel and hooks up to the factory 2 ¾” exhaust.
Let me preface with saying that Lethal's customer service is great and they'll back up all of their products. That said, I would personally stay away from this product as the fitment was horrible, even though the quality of the build seemed pretty good. I had rubbing of the frame in a serious way as well as leaks at both manifolds no matter how tight everything was bolted down or how much you tweaked its position at the connectors. Of course after some in depth research I found out this was common with this manufacturer but that's besides the point I suppose. Maybe it was just my car, who knows. I know one thing though, this surely did not fit my stock 2012 GT500. Spend more and get a better product. In any event though lethal performance will stand behind the products they sell and make sure it's right even if you have problems. (Posted on 3/26/14)