I have them, the transformation is amazing, the turn in is much faster and flatter, mid corner behavior is also excellent, still keeps the slight oversteery approach, no change in overall ride quality. Eibach took 2 full seconds off their lap times with them installed. The rear install is extremely easy, the front requires a sub frame drop, not super complicated but requires a few hours if doing it on jack stands (installation instructions are provided). Highly recommended.
https://www.youtube.com/watch?v=gGMSFRWopWU
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