Not de-tuned but rather never tuned. The big 4 don't even want to hear about a mini racing. Others are trying. DRX/DRR mini's are great out of the box and the cobra's are plenty fast.
More guts? You didn't see the one 90cc CVT machine do the doubles at Mt.Morris.
Doing something that you shouldn't be able to do takes more guts than doing it with a machine that should do it.