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First time after running the pipe behind the cab on our 5 ton with the 250 Cummins I put a straight chrome pipe on it but got over that fast we couldn't hear our radio or talk so a muffler went on. :deadhorse: Our 1997 A3 seems like a Cadillac to us after driving the 5 tons. We are seriously...

We have XM818 with 250 Cummins and M55A2 with Continental LDS 465 converted to fire trucks. We got rid of the under hood muffler on the XM818 running pipe behind the cab to a heavy duty regular truck muffler with extension that helped some on heat issues in summer and noise but they are both...