My experience with polyurethane bushing has been that they are much stiffer than OEM and don't dry rot like rubber bushings. To each his own, I guess. The only place I woundn't use them is in the motor mount, which makes the engine harsher.
BTW, thanks for posting FCP Euro. Looks like a good source for Porsche parts.
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2001 Boxster
2007 Toyota Highlander
2003 New Beetle Convertible, Turbo, Tip 6 speed
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