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The M3 guys at the Airstrip attack this past weekend were noticing a significant difference between the speedo and their Vboxs. I have been driving past one of those police speed things that warns you to slow down and at 60 mph indicated, the display on the police thing shows 54. I am running 255/35/19 and 275/35/19.
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2008 IB E92 M3| BBS | KW | Arkym | Platte Forme A.G. | Active Autowerke | K&N | Fabspeed | Dinan | Evolve-R |