My car was about 5-10% slower than the speedometer with stock 17" twists. Now have 18" Carrera light wheels, and it's a lot closer, maybe 2-3% slower now.
I guess it's probably helped me avoid speeding tickets!
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'99 986 Ocean Blue Metallic
'87 924S, winter beater
'17 VW Golf Sportwagen, for when I need extra seats
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