As you know there has been a frame update on all 2015 F3's and that was because of cracking. This has me rethinking my options right now so I'm sorry to say this is on hold. Best bet would be to go with the updated rear shock they offer now or an aftermarket shock like Fox or Elka.
ALBERT EINSTEIN
wasn't able to speak until he was four and didn't read until he was seven, causing his teachers and parents to think he was mentally handicapped, slow and anti-social.
IF YOU'VE NEVER FAILED YOU'VE NEVER TRIED ANYTHING NEW.