I have to agree. You should stay with the 19 inch rims you have. 20" chrome wheels on your boxster will make you car less responsive in the "pick-up" area giving you a feeling of a loss in torque. All that weight of 20" chrome on the rear flywheel will definately be noticeable. And I don't know many people using 19" at the track either. Maybe 18" but generaly speaking for track reasons you would want the O.E.M. wheel size or even smaller, hence giving you a lighter wheel and even more pick up. Hope this helps.
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