There are no classes of ITR in SCCA that allow you to run a VAFC.

As far as worth it or not, if you have cam gears and a FPR, you can get like another solid 10-16 whp out of a stock R. So yeah, for the price what we've seen is about a good 6-8whp with nothing else, dollar per hp, not bad at all.

I'd would say that you really should go tune your car after you've pretty much done all you're going to do though, otherwise you may find your self tuning it more frequently then you like.

Later!