The amount of them for sale around the web would surely indicate a performance benifit?
Wouldn't there?
They're a bit like seat covers, a really good idea, but do you really need 'princess' written all over them?
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Now - 2007Renault Megane sedan, Steel Gray, 19" Koya Ambush with 235/35R19 Yokohama ADVAN V103, Eibach Pro-Kit.
Gone but not forgotton - Diamond White 2004 LX Fiesta
If you sneeze with your eyes open, do your eyes pop out??