I also have the cobb mount installed.
i hardly noticed any vibes except when starting off.
But passengers don't feel a thing.
What i did notice is how much more planted it is, wheel hop only when wet and 1-2 bang only at redline
Silver SVT 2002 svtf4243.com
Silver ST3 MR::: 02 11 2013
GO :: Cobb RRM | Accelerator petal mod| JBR OCC | STS | Springs| Rear Swaybar | Tune
SHOW :: Lights tint | Calipers Painted| Graphite colored wheels| Back up Cam | Window Tint