[timberwoof]

What all is needed if I were to get an M-1 intake for a 2000 Durango 318?

 

[98Dak408]

Intake, throttle body, and thermostat gaskets as well as an intake install kit (for the 2-bbl M1). May need a water pump and radiator hose if they are damaged during removal.

 

[timberwoof]

Does it need to get tuned or can I leave the stock tune on it for a while?

 

[98Dak408]

Does it need to get tuned or can I leave the stock tune on it for a while?

I doubt you'd need a tune for just the intake but a tune would probably be more noticeable by itself than the intake. The intake would probably work better with a tune.