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I hate to say this but, that is a completely wheel/tire dependent question. I have Boxster S II 17" stock rims although they are not 18" I can not put spacers on the rears with 265 tires. The front will take up to a 21MM space with 225 tires. I track 18" OZ Alleggerita HLT. 9" rears again I can't run a spacer with 275 tires. The front 8.5" I can run a 14mm spacer with 235 tires.
It's going to depend on your combination
Off track I run 1 degree front and 1/2 degree rear chamber
On track I run 1.5 -2 degree front and 1 degree rear chamber
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2003 Black 986. modified for Advanced level HPDE and open track days.
* 3.6L LN block, 06 heads, Carrillo H rods, IDP with 987 intake, Oil mods, LN IMS. * Spec II Clutch, 3.2L S Spec P-P FW. * D2 shocks, GT3 arms & and links, Spacers front and rear * Weight reduced, No carpet, AC deleted, Remote PS pump, PS pump deleted. Recaro Pole position seats, Brey crouse ext. 5 point harness, NHP sport exhaust
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