Ok, I'm going to get dynomouth exhaust, by cutting off the pipe and replacing the muffler, and put the 18'' bullet in. I want to get an offroad y pipe with it. This is possible right? How much will it be together, with, and without installation?

 

The price of just swoping out the muffler will vary depending on where you have it done and if any addtion pipe needs to be fitted in the set up. As far as the offroad pipe, you might as well just skip it, if your gonna use the stock intermediate pipe.