When I bought the truck, it has just some bullets and dumps and it was LOUD! So, to quiet it down (not worrying too much about performace at the time wanting to make it more streetable), I ordered some 3" Summit Turbo mufflers because they were cheap and would do the trick (quiet) until I decide on exhaust.

How much do you think they are hurting me? I have 3" pipe from the headers to the mufflers to turn downs. It's pretty quiet.