i bought an '06 6s about a month ago and i heard an odd noise as well. at low RPM's in 1-3 gears, i heard a constant clicking in the engine. i brought it in under warranty and they said they couldn't hear it/nothing wrong. i have owned a lot of cars and i don't believe it to be normal. 2ndly...i was doing about 20mph in manual-mode 2nd, and the engine just cut off...battery stayed on, engine stalled...brought it in for that...couldn't duplicate problem. i like the car, but am really worried about it.