Questions questions:
myheadhertz: if you paint is not bubbling off your metal hood then the cf or fg are just fine. A turbo does not add all that much heat over a conventional setup. I had one on my turbo crx with no issues.
Marcus
I've run into this at work - quantifying heat damage to the epoxy that binds cf (or fg) parts is a real pain. The fibers themselves can take a bunch of heat, but epoxy is trickier than metals to evaluate. Aircraft designers love to use the stuff, but when your jet has an engine bay fire - "D'oh!"
Anyway, for a CRX with one of Marcus's nice hoods, an easy go/no-go is looking at the paint as he mentions. If your current metal hood doesn't have seriously browned or discolored paint underneath near the turbo, you're fine. A high enough temperature to char the epoxy would affect the paint on a metal hood as well.
This is something to watch out for if you ever have a "minor" underhood fire. A steel hood could possibly be cleaned and repainted, but a cf or fg hood may well be toast - fibers held together with charcoal.