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I think my 18s with good condition slicks are much lighter, but only slightly faster than the OEM ZLE set up. Maybe 1 second on a shorter course. There are also a number of 315/30/18 options with good pace that will fit front and rear. I think Falkens, Yok A052, Nankang, Conti ECF all come in that size. But I'm not sure I'd buy 18s just to run those tires (unless you're wanting to trade pace for some longevity and improved wet weather behavior). 19s with SC3R should be faster than all the 18" options except Hoosiers and full slicks.
It is nice to be able to run takeoffs from a price perspective (although some people don't like the inconsistency of what you get on the used market). At this point I'm kind of wishing I had looked into a square, fully rotatable wheel set up, but that comes with its own complications too.
The fast and simple answer is the OEM set up, driven to the track and back home. Pull over if it rains much, and prepare to spend a lot if tracking frequently.
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