Quote:
Originally Posted by asbrr
I would suggest doing more research. NVH tolerance is a subjective thing. Most seem to accept that poly or even solid RSFBs are acceptable. The Diff bushing though, I would say stick to a rubber or upgraded rubber part for a car that is street driven. Recall reading several posts about noticeable NVH increases with a poly diff bushing.
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I've read the same, anything stiffer on the diff bushings and the NVH increase is quite considerable.