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I don't know, its just a knee jerk reaction to every suspension thread I see since "call progress" is always the answer I read.
That is due to the same people answering the question and flooding the responses all the time. They push it but yet dont have any real data to back it up. I have never seen any fast drag car run progress suspension.
The springs are the part that everyone is most concerned with and it is the part that everyone SHOULD be least concerned with.