I have both engines (Listers SL1 & 2) mounted with their respective generator heads and have been mulling over a muffler system. I have an almost new stock muffler from my 94, Dodge/Cummins PU truck. Why couldn't I run both exhausts through that, it has a four inch inlet and is humungous. Of course I would have to fab up an adapter, no problem, Is this a totally crazy idea? Both gen sets might be run at the same time, but not normally.