It is a stainless muffler design for a Power stroke or duramax engine. They go through one muffler. So I think we will have room to spare as far as CFM through the muffler. It is a DNA muffler. They sound pretty good. We had to completely rework both ends to make the merge into the muffler from 2 3" pipes to one 5.5" muffler.
I might have a better pic of the merge.
Rodger
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