those square stacks look badd ass.

how about you build a box for them, like cut a hole in the flatbed where the exhaust would be like a normal stack kit and lay a 4x4 box tubing or whatever size you like all the way back box it up weld it or bolt it down and paint it. then get your stacks and mount them to the box, obviously cut holes in the box, i mean this is the only way i can think of to make it a clean install.

Does anyone make and sell those exhaust boxes?

i dont think so, but all you do is get some square tubing whatever size cut it to length box it up with some thin steel like 1/8 inch or whatever and drill your holes, so you can make it to any size.

Thats what i was gonna do around the stacks coming out of the bed. Just two small boxes around each stack instead of alone the pipes across. I still wanna run them just straight up outta the bed. Idk if i will do it tho. Thanks for the help!