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Exhaust fumes in ventilation system

Heating and Ventilation

Vehicle Information: Year: 1991; Engine (Size, Modifications): 3.3 Turbo with B&B Header System; Total Mileage: 46000;

I am getting exhaust fumes in the car when on the road, with the windows closed and the ventilation fan on. It happens whether or not the heat is on. On a recent 300 mile trip, I had to crack the windows and close the vents with the fan off to keep the fumes down enough for the car to be driveable. During track events, I haven't noticed it as the windows are always open. I haven't done any modifications to the ventilation system. Any thoughts?Thank you.

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