You guys mention dropping the muffler and using 4" pipe. What about dual 3" without muffler coming straight down from the manifold? I am new and have a f-350 crewcab, 4x4, basic non-turbo. I am wanting to get more power too. Don't know where to start either. I love this truck and will keep til my dieing day. Thanks for the forum and all the great threads.