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None that I've experienced.

Rather than a pre cleaner you can run the air ram, Donaldson makes them for out size intake. Others on the forum did testing comparing it to the stock mushroom cap and it makes an improvement. Old pic of it mounted on my m816. It's also more visually appealing than a prefilter haha. I'd do...

So long as the 8.3 is kept in it's main RPM range (2000+) then the turbo will help keep it cool. Below that the turbo isn't spooled up yet and not really helping anything. Your slow speed application isn't ideally suited to the 8.3 without some other upgrades (compound turbos). If you're in the...

First try manually down shifting to keep the rpm's in the 1600-2100 range, that's where the 855 series engines are happiest. Slow speed offroad driving is where the nhc250 beats the 6cta (and the 8.3 needs even higher RPM's to get the power or else it will build EGT's even faster/hotter).

Maximum rated temp at the exhaust manifold collector is 1200F with the mostly aluminum alloy pistons in the nhc250, 1150F is safer for extended high temps. The different alloy temps used in the other 855 series engines (335, 350, 400, etc) tolerate higher temps. Backing off the throttle...

Currently non turboed with the pyro mounted into the manifold a little before it's flange on the m816. When driving I keep it below 1150 but if I don't pay attention it will easily go to 1400F (not good). Fuel was turned up before I got the truck, haven't opened the pump to find out what button...