Weired vibration on steering wheel under acceleration?

[popdemonic]

HI I'm newbies here.I own the 1995 UrS6.Now I'm experiencing some knid of vibration issue when the car is under boost and gone when back in Vacuum.I just removed the propshaft to see the center bearing and F&R Cv joint to check because there was some crunking sound when the is accelerated. And found out the grease on the front CV joint was dried out. So I filled in with the fresh grease both F&R.Amazingly,The crunking sound was gone.The Centre bearing is supposedly to be in a good shape.
I also replaced the left front control arm and seem that this will help the vibration issue. the vibration is still there but lesser.Everytime when the car is under the boost,the vibration will come out through the steering wheel and the car has a bit vibration also. I have 2 sets of Rims one is stock 16" Avus and another is 19" w.work rims. the rims is proper balanced. The suspension was renewed a few thousand miles ago. one thing right here is the Rotor disc is bent because everytime
when i apply the brake the steering wheel will shake but.I'm really don't know if it will be related to this vibration.So now I'm really don't where to begin to diagnose this.
the wheel bearing is still stock it has never been replaced.Please shared me your guess.

Thanks

POP

[Acidburn]

your brake disc won't be helping it, whats the states of the mounts etc?

[popdemonic]

Thanks,What do you mean by the state of the mounts?
By the way,I'm planing to get one set of used CV joint of the front Axle (inner&outer)
for a swapping.Does it help?

[Acidburn]

It might do depending what your vibration is.

Just check to see if you can move the engine from side to side as it might have moved slightly and be rubbing/sitting on the subframe somewhere.

also check out this http://www.s2forum.com/forum/showthread.php?t=26210

[popdemonic]

I don't think the vibration is from the engine mounted or broken mounted.
As my car is automatic tranny,I can do the test by simply put in D gear and apply the brake.There's no any vibration when I did the test.the engine mounted and the tranny
mounted is pretty new. one of my friend lighthen me up,He said his Seat Alhambra has been ecperienced this and finally,It caused from the inner CV joint on the front axle.the symthom was coming on when the car is underboost or hard accelerated and off when I let off the gas.There's slightly vibration through out the car but be obvious on the steering wheel.