I drove a Red LIne, and noticed a noisy gear/ light grinding type of noise, when let up on the gas while the car was engine braking, or coasting in gear @ any speed, also when you press the gas in slowly you would notice it again, I asked the salesman if it was normal, and he hadn't even noticed it before.... funny thing, can't notice when under a med to heavy load, and while in neutral. Release bearing maybe? The second red Line I drove I did not notice it, but it was hot out, and I had the windows open, so you would not hear anything anyway... I'm currious as well if anyone out there has an explanation of what this might be.