E90 335i N55, MHD stage 2+, xhp stage 3

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Fresh Hankook S1 Evo 2 tyres in 255/35/18 to test traction from 0 to 100km
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Hi, can you explain how to calibrate speedometer to 280 km/h, i have replaced my gauges same like yours. I have a Perfect Toolbox programme, but i dont know how to calibrate it properly. I have + 10 km/h difference. maybe you can write yours speedo stats in Perfect Toolbox. Thanks

kietasriesutelis