I have never seen this mentioned. Sure they look cool but beleive it or not there turned out to be one hell of a benefit to using it.

I have urethane motor mounts and it shakes the **** out of the car. Turns out alot of that shaking comes from the heavy *** stock wheel with air bag. I guess it makes sense since it's kinda a 10 lb weight in the end of a stick.

But yeah since swaping it out my car is so much quieter. If you find you car shakes alot from performance bushing this is one way to really quiet things down.