There are a ton of mufflers to choose from...if you want a louder muffler, go with a 14" For dual in single out #' in 2 1/2" outlets, the number is 12198
18" 3" in / dual 2 1/2" outlets is 12288
Are you going to run dual pipes to the bumper or behind the wheel? Are you dumping under the bed? We can't do everything for you without knowing anything!