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This is purely hypothetical, but...
Most of us who have tried to replace our stock bushings with Poly bushings in the end links know how tightly the stock bushings are pressed in. The more one compresses rubber, the less flex it has. Polyurethane bushings have less flex than rubber, but still have a small amount of flex. That being the case, how much is really gained by replacing the tightly compressed rubber end link bushings with Polyurethane?
Glen
I replaced my admitedly well worn (50k plus mi.) rubber bushings with polys. It definatly improved my car. I've had them on for over a yr. now. I would do it again in a heart beat. Make sure you grease the poly bushings so they don't squeak!