To all the good guys who tried to help on this one...Noise (cracking or popping) coming from dash or fire wall at 75-80 mph. Was believed to be loose 2 piece plastic grille at base of windshield. Removed, put sealant putty on it and problem still persist. Removed grilles intirely to isolate problem. Still makes noise. Any suggestions. It's definitely related to wind as there is no symptoms under any other condition (i.e. RPM's, road condition, air conditioning, heater, blower). In advance, thanks again.