The Bilsteins I removed from my 90 when the 2Bennet coil overs were installed were broken. When you run them through their stroke the action is not smooth, there is a clunk too. Be careful with the urethane bushings. They are so hard you can actually crack suspension parts. Same with Delrin bushings. They are designed for track use on a car that is race prepped and inspected before and after every race where problems will be found and corrected promptly. For street use you can damage your car in a very expensive way. Know what you are doing before using racing parts in a street car.
Same for hard springs. Like I said, you want just enough spring rate to prevent bottoming and no more. If hard springs are so good, then why have them at all. Just go full rigid! No, the suspension must have compliance to absorb bumps so the car can corner without being disturbed by mid corner bumps. Too hard springs will ruin the car's handling on bumpy surfaces of public roads.
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Experience is what you get when you don't get what you want.
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