That is correct. I was hesitant at first as well, tho quite a few people have used them on track. As long as they are good quality, they aren't an issue. A 4th gen rear will eliminate the need for a rear spacer, tho at a minor overall weight penalty.
Looks like you answered your own question. For me, I was able to buy 2 1/2 sets of Z06 wheels an have money left over for the cost of 1 set of CTWs or the likes.
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