Not the power steering pump. I'm sure of that. It sounds like metal to metal. More of a vibration, but definitely an audible one as well. If I let up on the gas the sound stops, same if I give it more gas. The headers are in good shape, no holes, or excessive rust of any sort, I'll defiantly look closely at them. I just have a ~500 mile drive in a few days, I'm concerned if its a valvetrain problem that it will cause other damage from prolonged use. As well as only having the problem when the wheel is turned and at very light throttle it seems odd.