I've got the LC header, test pipe, and cat, then ran it straight out the rest of the way myself. I've got duals as well and didn't have any interference with the t-case crossmemeber, but it does rub the horse collar crossmember further back.
![](http://img406.imageshack.us/img406/9976/exhaustcmembmerclearancql9.jpg)
Hope that helps.