Thread: Exhaust fumes

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Bob is right, station wagons had that reversion problem which is why most have the exhaust routed into the slip stream at the rear/side of the car. With the symptoms you are describing, that is what is not happening.

Don

There's a reason why guys used to run cab stacks on older trucks. Not an option in your case, though.
Down turns out back might help. Small tail pipes to keep the gas velocity up, too. I don't like side exit pipes much, but maybe better safe than sorry.
Leaning the engine might make the smell less noticeable, but the monoxide will still be there, maybe more dangerous if you can't smell it so much.