It's nothing to do with legal this and that. It's to do with there seats suck, they can't lap as fast without them, and they lighten the car too BELOW stock weight, even with the recording equipment!
You just make this way to easy. The stock seats didn't seem to prevent Sport Auto from getting arguably the fastest production car time ever on the Hockenheim short course. (Yes, I know the Gumpert and Donkervoort are above it on the list that is why I said arguably.) I don't even wan't to bother with the weight thing anymore since we have shown many times that the car was not lighter than stock. You just don't want to believe it.
ZR1 TIME INVALID!
Used NONE STOCK racing seats the time is not in a PRDUCTION/STOCK car...
Facts are facts... Corvette cheated!
The only fact is that they used non stock seats. For Corvette to have cheated there would have to be some sort of official rules for the Ring and there are not. So, it is only your opinion that they cheated and it is not an opinion shared by the rest of the legitimate automotive community since most are accepting the time.
What amazes me is that you have no problem accepting the GT2 RS Ring time as valid when the time reported is obviously not real (no way it ran a 7:18.00 exactly) and there is no video or third party proof at all. For all you know it could have been gutted with only a single seat. How do you consider this time valid?