My car began having a noise in the cabin that corisponds to the rpm of the engine. At first it was very light but over 100 miles it became louder. It sounds like a speedo cable rubbing within its housing as an example. The guy at the dealership had the car for 3 weeks and could not find the source. He suspects noise transfer through the frame but doesn't know how. Does anyone have an idea. Thanks. MYMACH5