those 6" miters will have a nice deep tone to them. some people will say that stack are loud.....some of those same people drive crew cabs, the trucks I have been in that have stacks were not that loud at all, even at highway speeds in a single cab SD it was not loud at all. couple times that was with dual 5" miters and a single 6" miter. the only way I can see them being loud an annoying is if they were cut below the cab and were on a cummings.
I think it depends on what youre going to do with the truck. If you're eventually gonna hook to sleds or drag race you might wanna go with the stack. If not and you want just a regular exhaust go with that. Either way do what you wanna! It'll probably look good either way.
I'd go for a 4" system with no muffler. A 5" exhaust is also available as well. I am not a fan of stacks, but to each his/her own. Seems like every truck(gas or diesel) around my area has a stack(s). Anway, like said before, pick what you like and what you will enjoy.
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