Perfectly road legal in the US as far as I know. I know several cars old and new that come with centre locks (ferrari, porsche, lambo, jag...) and I've seen more than a few cars modified to use them (I think 034 motorsports did that). The closest we get to any kind of red tape in here in california where the smog laws are very strict but for classics older the 1976 it doesn't matter.
Now the race car is built as a race car first but is still street legal-ish with insurance and current tags required by a couple classes I compete in. That just means I have to mind my P's and Q's on the road.
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