Is your Onan MicroQuiet 4.0 quiet?

Catalyst would be fine with me. I'm tired of smelling exhaust fumes. Nox reduction can be done with or without EGR. Valve timing or 3 way catalyst may be enough. Personally not so thrilled with EGR although it has been used as a strategy to improve fuel economy (reduced pumping loss). There is no reason these units could not have much cleaner safer exhaust and ultimately less maintenance. Small engines have been running this technology for years without issue. Automotive engines for decades. There is also no need for it to be extra fire hazard with proper shielding.

I'm prepared for the onslaught :)