ok...so I straight piped it last night, and in the cab it is not loud at all. I really like the way it sounds, and it will really bark at ya when you get on it.
I will have to see what it sounds like when towing, if it is to loud then I will have to order a straight through muffler.
I kinda wish I had waited till after my trip next week, so that I could see what the MPG difference is. Oh well...