... Plus, if you want to run duals you will have to Y the pipe. And I am sorry, but that is just too gay. ...
of course, this is how every OTR truck with duals is running them.
OP-
i am on the fence and i have considered duals or a single stack behind the cab - neither for sound control, but for getting the exhaust out of my fender well. i like the looks of duals, but just like Lonesome' said, it's really tight under there to run a single pipe, let alone a Y.
the easiest way to do it would be like the pickups do; run it under the bed, 90° up into the bed and 'Y' it to seperate stacks in the front corners. or if you have room between the cab and bed.
i think i may attempt to keep the stack through the fender, but get rid of the 'J' to free up room for more wheel travel. if that doesn't seem to work, i'll look at a stack behind the cab.
you could always run it straight out the rear - a couple members on here have done it and liked it.