im getting my truck friday (finally) and i want to get some true duals done asap, i got a flowmaster 40 series si/do for my 300 and it sounded awesome for a 6, but now i have no idea what i should do thats why im asking the pro's, i wanted to get super 40's muffler(s), im not sure what i should do i want it to sound well and give me some h.p., all responses appreciated...thanks guys