Which size exhaust to go with?

We just got finished installing the TTI 3' all the way around exhaust bolt on kit, with the X pipe. Pics are comming soon. It was our first exhaust system install and other then them sending us the wrong hangers (which they happily traded back) there was no problems at all. The TTI system is built to fit PERFECTLY :finga: It does look a little funny as it sits on jack stands but other then that im very happy with it!