I knew someone who had a cavalier and he was in an accident. The airbags deployed. The air pressure in the car was so strong that it blewout the sunroof and he really felt it in his ears. That's with a vented car.
Just a thought, but you might want to find a solution for the vent, just in case.
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Favorite Off Road Trips: Death Valley & Joshua Tree
Off Roaded Vehicles: H2, Yukon, Suburban, Jeep Wrangler & Unlimited
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