[Pouncer911]

Hi guys, I'm new to the forum, bought my first 911 from North Carolina and drove cross country to CA 6 months ago. It vibrates intermittently while I maintain speed. The vibration will fade in and out. It seems to occur consistently between 45mph and about 130, after 140 I haven't really felt it. When it is gone, it's completely gone, but when it is present, it vibrates the steering wheel, seats and can even be heard from the windows. I have had rear tires replaced and balanced. The front tires were done by a buddy in NC before I bought the car and don't know if he checked the balancing. I did have the alignment done in NC before I left but this didn't take care of the problem. Any suggestions?