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What are you asking? Ur? Steel suspension? Read the Excellence article about 18 vs. 19. If I remember correctly, they said stick with 18 on non-S stock suspension, but stick with 19 if on PASM as it was designed around 19s.
Have 2600 miles on my 09 C2S with 2 days on the track with Volk 19s and PSCups - feels fine to me.