You should also look at a rear brake conversion so you can get an 18" slick under ther car. So many good options in an 18". Tires are going to be a limiting factor too.
When I broke diff internals I think it was due to the shock from breaking a half shaft.
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2014 ///M5 CP Tanzanite Blue/Cohiba - 11.15 @ 128.8 & 1.84 60' (2150' DA) - BPM Tune - MSR Intake - SSP DCT - SS DPs & HFC Mid Pipes/X-Over - E Race Muffs - 19" MT DRs... On to a new home.
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