I will say I have read that poly bushings are not fantastic for rotational items, and that picking a stiffer rubber would be better for daily drivers, while more solid metal units like Del-rin bushings are better for racing. I believe I saw that on Nasty somewhere.
Just .02. The reasoning behind it is that Poly is more of a gel, and with lots of abuse, can get real soft, softer then rubber.
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2/20/2013: They Day the ****s Stopped
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