I have a 04 peterbilt 330 with a single exhaust pipe under the truck. I would like to remove the muffler and install 2 stacks with mufflers in the stacks (quiet mufflers). I was told that I have to use the existing muffler because it acts like a catalytic converter?
have the same problem?
Wednesday, July 11th, 2012 AT 2:13 AM