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I don't have any direct experience with a 912 exhaust - I assume it's similar to a Type I VW setup.
The construction of the heater box is such that the outer shell is considerably cooler than the exhaust tube inside it. If you ran j-tubes instead, you would have a larger source of heat running directly under the heads. As a result, the heads run hotter. You could wrap the j-tubes in exhaust wrap and insulate them as much as possible.
I don't think removing the heater boxes will increase airflow, but It will remove some weight.
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