At 165k they are almost certainly blown, if not a LONG time ago. To test, push down on the car and let it come back up, if it bounces up and down, it's blown. If it comes back up and stops with minimal bounce, its good. The SH has different front struts and springs, so keep that in mind when replacing them. You can switch over to base (non SH) springs and struts, but you CANNOT mix and match.
Some videos will show that its ok for the car to bounce a maximum of 3 times, however the preludes tighter suspension should not bounce more than once in my opinion.