Are any of the joints blowing...particularly the flexible coupling? Exhaust manifold sealed to the downpipe? To test if the car is drawing in fumes from it's low air pressure behind the hatch put the heater blower on full to pressurise the cabin and see if this reduces them. Does the tailpipe stick right out to the extremity of the rear or is it dumping fumes under the back skirt?
Just ideas. Difficult to diagnose from afar![]()
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