KW HAS Kit: Heavy Vibration

[flaury23]

I installed the KW HAS kit a few weeks ago and I have been experiencing a heavy vibration. The vibration is ONLY felt during 50mph and greater acceleration (moderate to heavy). There is no vibration during cruising or breaking.

Also the vibration is not felt in the steering wheel, it's more so in the cabin of the car. The car is under warranty so after bmw inspecting the differential, axles, spacers, etc. They determine it was suspension related when they raised the car and it went away.

I will be taking it to the shop that did the install, but was curious if anyone else have experienced this.