Excellent write up Sorry for digging up an old thread but I am curious for those who have switched over to the PM bushings. Have you found any downsides to using poly bushings such as increased road noise, squeaks or a harsher ride? I know from my Jeeps the poly's are stiffer, will handle better and will last longer, but also transmit a lot more road and mechanical noise, and my X is my oasis from that.