i know this has been addressed before, but i have a new question about it. obviously, the problem is exhaust blowing, or sucking, into the cab when the rear window is down. does this happen with the tailgate off, too? it seems like that might allow the pressure to equalize and not suck that nasty cloud in. any other suggestions? since my conensor coil has a big hole in it (stupid po), and it's 100+ degrees outside, driving around with the windows up is like being in a huge oven.