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spotter-
Someone in the comments was saying those things have so much power that they burn a crazy amount of fuel and it’s not physically possible to suck enough air into the engine to match the fuelling so a lot comes out the stacks.
I don’t know why they don’t turn down the fuelling in that case, I don’t know much about engines, let alone diesel truck engines.
PhilDAS
environmentally poor fits this too:
https://www.youtube.com/watch?v=J72N7NRKljQ