While on this subject of deventing the middle air vents. I have always not liked the vents anyways. I would like to replace them with ones that would allow them to fully cut off. I personally do not think loosing your middle vents will mater much at all. How easy would it be to redirect the airflow or block it so that more pressure comes out of the remaining? I have been thinking about the in dash large LCD as well but would like to make sure that the middle vents cane be properly blocked.