I doubt they are replacing both heads for a cylinder 2 misfire. They are replacing the driver side head. And I can do that head swap in a day. And it will tick when you get it back cause we reuse the camshafts, cam gears, cam phasers, lifters & rocker arms. And these are just noisey engines & a good portion of the noise is injectors as well. Thats what the engine cover is for on these engines. It's to help hide some of the sound. And if that dealer didn't know about misfires on the 2,4,6 bank they must be either a very low volume dealer or ignorant. We do way more of these head replacements on mini vans by far cause they got this engine in the 2011 models.