EXHAUST MANIFOLD CRACKING ON TOYOTA V8 4.7 ENGINE ALLOWING EXHAUST FUMES INTO THE CABIN AND CAUSING DIZZINESS. WHEN DOING MY RESEARCH IVE SEEN PAGES AND PAGES OF THIS ISSUE KNOWN TO TOYOTA ABOUT THE 4.7 ENGINE THAT IS USED IN A NUMBER OF THERE MODELS FROM LEXUS TO THE TUNDRA PICK LINES AND ANYTHING THAT USES THE 4.7 ENGINE. THIS IS DEADLY BEING IN THE MIDWEST AND YOU HAVE YOUR WINDOWS UP AND HEAT ON IN THE WINTER OR SUMMER WITH AC ON. THANK YOU FOR YOUR TIME