I did extensive autocrossing with my RSR, and going back to 15's (from 17's) made a HUGE improvement in my times. Consider doing some 7 & 9 Group 4 wheels, perhaps?
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Michael O'Neal -
69 RSR Clone(ish) - The build: http://bit.ly/69porschersr
69 911S Blasphemy Build on YouTube
Rennch Youtube Channel: http://rennch.com/Youtube Instagram: https://www.instagram.com/_rennch_/
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