I would think that money would be better spent on aerodynamics than on the engine. The best fuel saver for the engine is your right foot. If its a box truck a nosecone may help.
There is no dpf, but have you gutted the kitty?
I don't know of a bigger pipe is available, you could always have one welded up.
Still, it's a small engine in a large brick.
Don't be Sammy Hagar
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