actually, my aluminum one is about 3 times heavier than the stock core. Still it's only a ~10 lbs increase, which is just a 0.6% increase of weight over the front axle. I doubt it'll be noticeable.
I'd check the front camber and rear camber, as those will affect cornering forces on each axle the most. Generally for oversteer, you want to decrease the camber up front. Tightening up the rear axle with M3 subframe bushings and end links should help too.
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Josh-
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