Well I made up my mind. I ordered 10' of 5" exhaust pipe from my warehouse for $60. Gonna build a pair of em, but not mount them in the corners. Gonna mount them centrally in the bed about 2' feet apart, haven't decided whether or not to angle them square'em off or slant them. I will have pictures eventually as I have five wisdom teeth to have pulled on Friday and won't get to it this weekend OUCH!