Unless I misunderstood your post, you cut the crosspieces out of the bumper skin. Can't really glue them back, out here I've seen it on plenty of ITS cars so I can understand why you may have done it. I don't know that it really helps with cooling though.

You need a new bumper skin. THe later model RX-7 (89-91) skin is hard to find, since a lot of street guys like it as it is more modern looking. It shouldn't cost more than 300..

I couldn't see how the ITCS allows that so I left mine alone.

Good luck.

PaulC