I think most of use are running singles. My answer maybe different if I did have twins or triples, but I don't. Are you running a stack?
No, but I am seriously considering putting one on. I do not want something with in cab drone though. Right now it is pretty quiet with 5" exhaust and Aero turbine muffler. I feel that a stack would help with intermediate throttle smoke getting on people. People do not like smoke getting in their way when driving.