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Rule of thumb seems to be 3:91's for N/A and 3:73's for FI.
Mine's an M6 but even if I went FI I'd keep my 3:91's and put the money in suspension for grip.
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2010 2SS/RS M6 - CAI Intake - Borla Stinger - VTC - 3.91's
Eibach Sways - LG ZR28's - BMR Springs - 285/35 Squared
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