I haven't got my 200 yet (it's a few days away), but I think that if you could somehow reduce the "vacuum" of air getting sucked out of the cabin by the breathers in the rear of the vehicle (like on the sides of a troopie), then even on "recirc" the cabin would be pressurized. By sealing them almost (or even completely) would be a start. Just gotta watch co2 buildup on long trips! Your thoughts?