Cummins 6CTA 8.3L

[Twigg]

Does anyone know if there are physical differences between this engine tuned for 250 hp, and the same engine tuned for 210 hp?

Is it simply a matter of fuel plate and timing, or are there parts differences.

I know these engines can be tuned for 350+ hp, but that does involve different injectors and probably a different turbo ...