The race cars are going to be ridiculously heavy, it's not as big of a difference as you'd think.
Road hypercars are generally in the region of as fast as GT3s around a track, obviously depending on the layout quite a bit. I think it's very much possible for a road legal car to be faster than a GTE at Le Mans but it would still be quite a large gap to bridge to 3:25-3:30 showroom stock.
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