Spacers go between the hub and and wheel effectively reducing the wheel ET (offset) and pushing the wheelout to increase track. Aero wipers do look better but I think they perform better and are quieter.
Not necessarily better performing or quieter. I out a set of oem golf iv aero arms and wipers I bought from vw and they were rubbish on the down sweep and alot louder compared to my new bosch normal ones on my new leon....
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