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I just bolted the M3 rear bar and the ic front bar onto my '84 325E. The rear went from the stock 12mm to the M3 14.5mm. The front went from the stock 18.5 to the ic 21mm. I know the aftermarket bars are bigger but these were cheap and easy to get.
My question is, do I need to beef up the mounts? I'll be doing a couple of schools and a couple of BMW CCA Club races, on R compound tires of course, plus about 3,000 spirited street miles this year. It also has M3 springs and Bilstein Sports.
Thanks,
Carter