Originally Posted by
MarkN
It could be a pressure build up inside the car contibuting to this; - you haven't done anything to block the ventilation holes from the cabin to the outside have you?
Seems unlikely that you would fit three very badly adjusted roofs. Hence they might be blown out by increased air pressure inside the car at speed.
Its not an aircraft mate and nothing to do with pressure in side the car . as i said id reckon its to high on the front or wind getting under the front rubber . No offence mate.
Regards
Dave.