complies with IT or complies with ST.

there was a situation last year where a protested ITS car (kershaw, may?) decided to duck the protest by switching to STU. tech had him remove his factory rear spoiler to comply (which I don't believe was something he should have had to do, even in STU rules at that time). I don't know if he had a fire system, but I feel pretty confidently that his oil pan drain plug was not safety wired. interesting one because it was "an IT car" that theoretically conformed to IT rules, but contention on the second point was why he had to run STU. so I guess he should have been required to be 100% in compliance with STU. as it wound up he was a hybrid.

point is - there was, and is, a lot of confusion out there as to what STU rules allow / require and how the IT crossover works.