Well i have been battling an exhaust problem and was searching for a oe style cat replacement for my truck an 06 mega cab no one makes that but they do make the oe style y pipe and cats for a 2500 model which is the same exhaust it toke forever to find this and it is at a reasonable price WALKER Part #55579 note that if you order this you must also order WALKER Part # 52490 Front Pipe in order to get the whole assembly that goes under the tranny to the other manifold the only place i have seen it for sale is http://www.rockauto.com/catalog/raframecatalog.php