Seems a bit obvious to say find out where the exhaust is leaking. If you can get it up on a lift that is good. Then get someone to hold a pad of rags or a folded leather clove over the end of the exhaust. Leaks should then be obvious. Fix 'em. If you have a non standard exhaust, and leaky trunk seals aerodynamics may allow fumes to come back through the trunk and into the car. Exhaust to manifold leaks combined with a poor or no seal around the steering column will also flow fumes into the car.
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