Well i am planning on getting a cummins soon. The first to mods i want to do are guages and exhaust. I want an exhaust that sounds great but isn't terribly loud. I pull a trailer a lot through residential and towns so i dont want something obnoxious. I also will be plowing snow and plowing stuff at 2 am with a straight piped cummins isn't something my customers would appreciate. So what can i do. Is the MBRP 4" turbo back system really loud? I really dont know what to look for. Want something that sounds great but isn't annoying.