GQ with dual fuel, snorkle????

Yes u can...........have seen plenty. You need to change the air cleaner element back to a standard enclosed type. Not done it myself but have seen this in other cars.

83690033 4wd systems do them with a modification

I was led to believe that only certain gas systems would accept a snorkel,something about the snorkel pressurising something/somewhere!!(hows that for vauge)