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On that 9.5, another way the exhaust could be getting to the powerhead is broken rubber bellows on the shift rod where it goes through from the exhaust housing to the inner housing where the powerhead is – you cannot see this part without taking a lot of stuff apart. The bellows is a discontinued part.
The motor has no muffler – the exhaust goes out underwater to make it quiet. What you are seeing is the carb intake intake screen. It’s a flat metal part with round holes in it.
When that model motor won’t idle good without the cover removed, the bellows I mentioned or the items Fisherman6 mentioned are the culprits, allowing exhaust to go up under the cover and be pulled into the carb.
Dave