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I swapped to APEX ARC-8 19x10, 19x11's with 285/30R19 PS4S tires and 305/30R19 R888R's in the rear. Nice torque increase from the effective gearing change, fantastic grip, notably quicker and peppier all around. 32lbs or so lost rotating and lower distance from centerline, so much less rotational inertia. Calculates similarly to the GT350R vs GT350 differences overall, about 0.2-0.3 gain assuming traction.
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