Ran a straight pipe 5" that dumped infront of the rear axle. Was fitted on the stock hangers. PO had a full 5" on in stock location but as I was changing rear tank to 38 US gallon one would have been minimal room and didn't like the exit point. So interim ran it as above, till I put on a 4" full length stock location system.
5" straight pipe and turn down dumping infront of axle was loud, I didn't care for the soot all over the rear of the sig truck either. To bump aft of axle you obviously loose spare tire too... If you tow lots I think the reflected noise back from the trailer would be annoying after a while.
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