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 0. The "moan" sound is gone. [QUOTE] I have a "moan" or "howl" that seems to be throttle related. It comes and goes as the speed of the incoming air changes with different power outputs. It is sometimes heard even at idle after a cold start. The engine is a Mitsu 2.5 V6 with Holley fuel injection. Holley says they have no product support as this unit was built to Chrysler specifications. The last time we had it back to the dealer for service we asked for this problem to be eliminated. It wasn't. The dealer claimed they didn't have an "A" technician available to do it. That must mean that our other service items were done by underqualified mechanics. Very Comforting. Does anyone have this problem and/or know of a fix for it?[/QUOTE] 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.