my first question is about what brands and aprox price of a cold air intake system for a 4.2 V6 f150

my second is about the i think its a manifold, ive seen people open the area where the air flows from stock to a little larger to allow more air into the engine, any recomendations about that

and my last question is im thinking about getting a turbocharger, would that effect the cold air intake in any way?

thanks