"The increase in abrupt bump harshness is probably due more to tires than the poly bushings. Going to a lower profile sidewall (less meat between the rim and the tire tread) will amplify bump harshness."
That and the fact that I'm running 40 PSI in the front, 35 in the rear, where it used to be 28 all around. All in all, it's changed the car totally, and it's a blast to drive.
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