I agree with SYT_Shadow that stock arms are stronger than aftermarket arms. However, with frequent inspection (which should be done on stock arms, too!) and preventative maintenance (e.g., replace suspension arm bolts once per season/after X number of days or as required due to off track excursions, etc.), aftermarket suspension arms can be used safely. Suspension arms are one of the last things that I do (except for front thrust arm monoballs and rear toe arms) when modifying a street car to a dual-use car.
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