1996 Cirrus noise source found

I found a fatigue crack in the metal bellows in the crossover exhaust
pipe going from the front to the rear of the engine. The crack went
about halfway around the bellows and was fairly tight with little
apparent leakage. Auto Zone and Pep Boys do not sell just a bellows
repair kit. I got a price on the entire pipe assembly. After regaining
conciousness, I called a friend who operates an auto repair facility
with on site manufacturing of exhaust systems a specialty. He cut off
the cracked bellows and welded in a replacement. Total cost $100. The
"moan" sound is gone.

I can't imagine the noise. You focus on the air and fuel systems; are
you
sure of that? Could it be exhaust system?

Sounds like you should find a different dealer for service.