its a little bit like a K&N filter. they last longer than standard items do and do make a little bit of difference but people like, my mum, probably couldn't tell any difference.
my saxo has got nylon bushes and they feel good, though not that much better than standard really.
i once got fairly familiar with an old cosworth that was running its original bushes everywhere as far as i could tell then completely polybushed it and the difference was amazing! it was noticeable just driving it off the curb, it was so much less... 'floppy' lol
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