Had springs installed a few weeks ago and I think it was around then that I noticed a knocking sound coming from behind the dash/engine compartment area. It's only at low speeds (like 5-10 in a parking lot), more noticeable in turns, and isn't there on a cold start. It only happens after I've been driving for at least 20 minutes. So yesterday, I drove around all day and then heard it when I came home. Went inside for an hour and came back out and it was still there. Went somewhere else and the car was sitting for a few hours and then the noise was gone on the way home. Could it be my AC? Everything else is stock except springs and short shifter and Stage 1 AP. Do stock sways "walk"?