On 3-4 occassions when cornering hard at the last couple of autoxes, I've heard/felt a loud bang at the rear end of my car. I've now figured out that it is my Koni SA Yellow shocks, w/rebound at 1/2firm, bottoming out. Stiffer srings would prevent that from happening, but that would move me out of the stock class. BTW, the shocks were installed about 6,000 miles ago, have seen only 4-5 autoxes and are in great shape. Any advice/suggestions?