I built an exhaust system for an Onan twin 4kw gen set. I had it on a pallet with a 35 gallon tank and a couple batteries. It would fit in the bed of my pickup and power my RV at the drags during the summer. I used a Toyota pickup muffler and it was a little noisy. I restricted the tailpipe from 1.5" to 1" and it quieted down and ran fine.
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