I had a similar exhaust system on my 1995 Cummins. What looks like a "muffler" is actually nothing more than a resonator that (barely) changes the tone of the exhaust note. It's basically a straight pipe with some holes in it to tune the sound. Quiet it is not.
If the van still has a catalytic converter, then it might not be too bad, but I can say with some confidence it will definitely be louder than the stock system by a fair number of dB. My 95 Cummins 12V was a turbo-back system. That truck was freakin' loud... I'm sure my neighbors loved it when I drove that truck to work leaving at 5AM...
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1992 E350 7.3 IDI - "The White Whale" RV conversion planned.
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