Just bought a 2012 SXT with 16000 miles and I noticed a whine like this almost immediately. I can actually recreate it without fail by manually getting to 3000rpm in 4th gear and then letting of the gas so the engine winds down, its sooooo loud. Never heard an engine make a high pitch sound like that. When I first heard it i was like........is this engine supercharged or turbo and I dont know it? Still cant figure it out. Calling dealer tomarrow.