Hello
Now way for suking back the exhaustgases if driving at higher speeds.
If you have the flap exchangers then you can smell the engine gets hoter. Sometimes cleaning from the oilcooler and the cylinderfins give fresh air. Also check for any oil leaks.
Just like I said before; there is no exhaust fume in the cabin as long the J pipes have no crack. All the smell comes from the engine cooling and that is what all aircooled heating systems have to bear. Just keep the heat exchanger and the heatproducer as clean as possible and you only can smell the overheatet air.
Grüsse
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