I have posted this before: I have the Flowmaster 70 series big block mufflers on my 350 with 2.5" aluminized pipes with a custom H pipe just behind the tranny/transfer. They are nice and quiet you can listen to the radio in the cab turned down low, but when you get on it they make the most awesome mellow roar you have ever heard on a 350. EVERYONE LOVES IT~! Plus it is like a sleeper. I can be sitting next to someone at a light who thinks they are cool and just punch it once with the clutch in and their eyes light up, WAY COOL!