I got into a huge debate/argument about dual exhaust to dayin one of my college classes. I and another classmate were talking aboutexhaust upgrades and I said I wanted dual exhaust. A guy next to me chimed inand said just remove everything and put two pipes out the back with no muffleror anything. I began to explain that doing so would be harmful to the motorbecause the cylinders could not equal out causing major performance problems. Heand another guy got all upset saying it does not matter and if I was true thenhow do people run open headers on hot rods and such. Not having an answer tothat I gave up and quit talking. So who is right? Why do you need to put an xpipe in and how do the hot rods get away with having open headers. I have a2001 silverado 5.3L also