ChrisM
Mostly harmless.
I seem to recall there is some demand for heat extractor vents for the GT350 hoods that are similar to the GT4. I was browsing this website looking at splitters and saw he is making vents from aluminum if any GT350 owners are interested:
http://carterscustoms04.com/heat-extractor-hood/
http://carterscustoms04.com/heat-extractor-hood/