About 2 years ago ( or it might have been last year) a certain racing rep. for one of the big 3 automakers tried to get hp reductions on some combos.
He was trying for a 20 % or so reduction on combos that are rarely used. ( mostly OBD II combos already in the classification guide )
Anyways, he went to Calif. to talk to NHRA about it but did not have any luck.