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If diesels like it cold, why do some big diesels have intake warmers ? I'll agree it depends on the engine and outside temp. Typically intake manifold temps below 50deg F are less than optimal.
Try unhooking your exhaut after the down pipe and let me know how the free running exhaust works for you. Everything has limits. That said, it won't be an issue if he stays with practial pipe size. I have seen trucks that run like dogs with dual 8" straight stacks.
The larger injectors alow the same amount of fuel to be injected in a shorter time. This causes more to be burnt while the piston is closer to TDC. These engines are individual solenoid operated injectors, not distribution pumps like ours. Totally different animal. They vary pulse width like a fuel injected gasser not stroke length like a dist pump system.
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