Have you stiffened your chassis? I prepare car for engine swap and during disassembly I found a crack. I have welded subframe connectors and strut brace. K-member original cobra but supported to front of subframe with stiff pipe. My car has zero rust. It has rather solid suspension. Front control arms are stock. Rear control arms has aluminum/pom bushings, and steering rack too. Pom is bit harder than delrin. We have autoslalom championship in our club, similar to your autocross. I participate in it, 5 races in a year, and several track days too. It is maybe the cause.
Any pics what you have done?
Any pics what you have done?
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