i have seen some guys runnin stacks with box tubing and instead of exhaust pipe in the bed i was wondering if this was an ok thing to do? if there are any negatives by doing it this way?

 

I guess its easier to do tubing if you are fabricating it yourself. Otherwise I would personally prefer the pipe, mainly for noise transition, I would think smoother surfaces would deter raspiness but that's theory.

 

X2. I would have to think that their would be alot off bouncing around and producing 'pinging' noises.