I once hit a nasty ridge on the front right side at 70 kph, the car started vibrating as well. It also started drifting to the right, the alignment was totally off. Not sure whether it was gear-related. This is what I fixed to get rid of the vibration: - new lower right engine mount (I think it was ...

that is the compressor bypass line it goes over to the the intake manifold tree. It sends boost pressure over to open the CBV mechanically depending on the spring installed, 8 pounds of boost stock. its function is to vent boost if you suddenly see a cop during high boost but before the waste gate c...