I've had my WE4 for over 6 years. When I got it at 77,000 miles I replaced the valve springs with the GSCA club springs which I think were around 90 PSI springs. My question is, now that the car has 146,000 miles on the clock does anyone think that I should replace the springs again? Do the good springs wear out? I know I should probably replace the timing chain as well. It's the original.