slight hijack here but what rear heater are you using? my 40 is stinking cold in the winter. am insulated headliner will serve me in both heat and cold but i need the heater you have!!Noise in a FJ-40, say it ain't so. Yea I'm more interested in keeping heat out in the summer. I have a large back heater and can/have drive around at 30 MPH in -30 weather wearing shorts and a tee shirt with the windows down. Kick and cowl vents closed. I'm guessing some sort of glue in closed cell foam.