So my uncle owns a nice 2002 F-350 crewcab shortbox. 7.3 real nice sound. one day a 7.3 pulled up and sounded quieter, like quite a bit. so today my uncle gave me a ride ome I had to drop my truck off to get the brakes checked and before we pulled out I looke under the truck at the exhaust and noticed that the original owner cut the muffler out and put in a pipe. that and it has no cat either.
My uncle had no idea the entire time of owning his truck 4 years now. that it was straight piped.
any way felt like sharing that.