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Patracy, That is very interesting about the dual high pressure pumps used to increase delivery in the smaller "non-stock" engines. I have been into these pumps (stock) before in order to id failures/cause of failures (amazingly engineered by the way), but with 24,000+ psi in the manifold (at...

Common rail 5.9 fuel flow increase? How do you do that? (That's a real question, not sarcasm) 525 N14s do not have a fuel line "up-grades" to make more power. The pump pressures are the same for 100+ hp differentiation... injectors and timing change torque curves and hp ratings. Regards, Bob