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Tracking / Autocross / HPDE / Drifting
08-13-2025, 05:52 PM
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3.90 GR86 Diff in a 2013 BRZ - Good combo for boost?
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B T
Used 3.7 direct swap with a good diff seemed...
Used 3.7 direct swap with a good diff seemed almost impossible to find, just switched the ring and pinion in mine to 3.7, still no traction until 70
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