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I have a 2013 FR-S which had standard shocks for some time.
Those definitely felt a bit overdamped and crashy.
I then switched to PP Sachs when one of my stock Showas started leaking at 65k miles.
My impression of the differences:
The Sachs have a bit more low speed compression, so initial turn in support is improved. The stock FR-S shocks like you would hit the rear bump stops with a higher shock velocity which I feel made the car more tail-happy. The Sachs mitigate this to some extent, also the bump stops are a different color and possibly have a different spring rate range.
The Sachs don't have a ride quality that I feel is leaps and bounds better than the FR-S. They both have a sensation of feeling overdamped, the Sachs maybe a little less so.
Neither is really what I'd call a track-ready shock/spring setup. On bumpy tracks and sticky tires(<=200tw), you will find the available travel is insufficient. On high-g corners with some bumps, the chassis will have some oscillations from that lack of travel. (Buttonwillow's Riverside comes to mind)
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