What type of aftermarket exhaust are you guys using? I know nothing about them. A shop by my house recommended a flowmaster muffler with their pipes. I'm not sure what type of exhaust pipes they use. Anyway, I guess Flowmaster makes a version that is load on takeoff but then levels out after so the cab noise is minimal. That is what I want. He had it on his truck there and it looked and sounded great. Anyway, he said $350 for dual either running out the isde or rear out the door. Any thoughts or recommendations? Things I should know, etc? Thanks!