Does anybody know if the Flowmaster American Thunder cat back (3" single in/single out) includes the exact same pipe that goes from the cat to the muffler as in the American Thunder (3" single in/2.5" dual out)? I need to know this because I may eventually want to replace that single out muffler with a dual out muffler. I am concerned that the pipe on the single out system may block the way for a tailpipe to come out on that side. Any help would be much appreciated. Thanks.