Having just been to nationals with a slightly prepped BSP car I can tell you it could be competitive. But, it will require a significant investment in suspension....motons or equivalent. Fenders do not have to be cut to run 285 hoosiers front and rear. With an extremely good suspension and 900-1000 lb front and 1000-1100 lb rear springs, race seats, light battery and keeping the AC I am sure the Z4M can be nationally competitive in BSP
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2016 BMW M4 MW 6SPD,2005 Honda S2000
2014 Subaru STI (Sold),2008 BMW Z4 MC (Sold)
2012 VW GTI (Sold),2006 Subaru STI (Sold)
2003 Subaru WRX (Sold),1996 Mustang Cobra (Sold)
1986 Dodge Shelby Charger (Sold)
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