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It looks like a compound twin turbo setup on a large diesel engine....that someone did a shitty job spray painting yellow.
That's how diesel guys do. It's like painting a 240sx flat black. It's supposed to be a statement about how they're more concerned with performance than appearance.
I work in a large repair shop and we service semis on one side and light trucks and cars on the other. I work on the latter and I have no idea what type of truck this is. They had the hood up and it caught my eye so I snapped a pic.