Help me my Eyes are watering

Well heres the deal, my wife says she is done riding in my car untill i figure out where and how I keep getting exhaust in the car, took my car over to a reliable muffler shop he went over it found a bunch of leaks, welded all shut, it was better, but on our way down to Appleton last weekend to a show by the time we got there both our eyes were watering, called the muffler guy this week he thinks I have a bad trunk seal (which I have a new one not installed yet) my exhaust exits below the bumper, no tips 2 1/2" all the way back, I do have electric cut outs, but they dont seem to leaking, any ideas??