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Another data point -
I got to -2.5 with 1" lowering springs, 14mm SPC bolt in the bottom hole and the bottom bolt moved to the top hole, and then added pedders tophats which got me to -3.25. 10k street miles and two track days they have not slipped at all (running RT660s, laptimes about 2 seconds below spec miata times on a 75 second track). Based on tirewear I would ideally probably be at -4*, but oh well, this has been a fantastic budget setup.
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2013 BRZ Limited, NASA Instructor, ex-spec miata racer
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