Originally Posted by ibidu1

The brand of springs or coilovers does not matter to the AWD. What matters is the amount of drop, because the cv axles were design too short for our cars. The slightest drop allows the axles to fit loosse, so you get vibes and whobbles. If you add length (spacer 9-10mm) to the cv axle this should cure the vibrating and whobbles.

Also what I believe has some effect is how the wheel alignment is adjusted. The more negative camber the more it helps stopping vibrations. This is why I believe, certain GS AWD's vibrate with Fsport springs and others don't.

With the EZ streets you might be able to get away with 1" drop, play with the adjustments till you get it right.