I have a 2000 RS. I have AGX's on all four corners and I have Tein Stech springs. I have had that combo for the past 90k kms. I realize the springs probably caused the rear strut to fail. Saying that should I replace all 4 struts eventhough the fronts are not leaking oil? I plan on replacing with P1 springs when replacing the rear struts. Also anyone have experience switching from Stech to P1's in terms of ride etc?