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I figured I'd give a rundown as well to give others with this problem some starting points and to tell what I've down.
My car is not a track car and every bit of the interior (both cabin and trunk).
I have all the rubber boots and the leather shifter boot.
I have no open holes in my firewall.
Full working hvac system.
I made sure the exhaust tip is far beyond the end of the bumper.
I had my super expensive wisesquare/berman exhaust mani at a machine shop with my elbow and d/p to have all the flanges flattened and replaced all gaskets for these areas.
I very closely examed the vent box and flap in the trunk(the pressure thing Mrfairlady mentioned and it's perfect.
I redid the piece of rubber between the back of the hood an the cowl vents.
My car is freshly painted and I'm thinking they may not have sealed the tails but there is a lot of monoxide making its way in when any window is open so I have a hard Time believing that's the issue.
Plan for next fun greasy work time will be to reinspect (for a third time) my test pipe gaskets and see what the mexican'ts did to seal my tails.
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