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Yea the engine burns off the particulates, I'm not exactly sure what the preferred method for that is.
The main particulate problem I think actually comes from lower load, where the injector is only spraying on the compression stroke. You get a lot of unburned fuel that way. Under heavy load, most of the fuel is sprayed on the intake stroke and mixes with the air better.
Sometimes I kind of like how port injection is so simple...
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