There's quite a wide range of things it could be. Is your air filter mounted properly (or even there?). Is there a leak in your intercooler/charge air hosing? Is there a leak in your CAT or one of the gaskets in the exhaust? Is the radiator fan completely intact (no cracked blades) or is it rubbing against the back of the radiator when you accelerate hard? Is the alternator pulley slipping on its shaft? Has someone put the wrong coolant in the radiator and it's thickened up and causing the water pump to make noise? Is the rear diff input shaft bearing seal leaking, perhaps spinning under power?
As you can see, there's a LOT of things that could do it.
You can look at the air intake path and the exhaust - when the engine's cold - look for black stuff coming OUT of these.
Keep us posted!