The roll cage and fire jacket rules apply to any NHRA track. At Lfest, you still have to be able to abide by the rules since KCIR is an NHRA track.
The last couple of WFC's have had the break between Street and Pro at 11.49 since that is where the cage rule applies. So, since they give you a .1 sec breakout, you can't qualify faster than 11.59 and still run Street.
And I believe last year they were bumping people up to pro if they qualified that fast. I know they will do that IF somebody in Street calls them on it - and I can guarantee you that will happen if it's caught.