Simple question, can I use a crx still in street without an airbag since it was never OEM?
If not, is there a modification I can make so it is legal?
A CRX is legal in Pro Stock 5k regardless of airbag or not. It is not legal for Street Stock 1k. There is no modification that can be made that would make it OEM as it doesn't come with an OEM airbag.