how do you install a HIGH FLOW RAM AIR INTAKE system in a 4 cyl Camry?

Answer 1

Find a complete kit that fits.
In my opinion your waisting your money as Toyota offers their own line of high flow air cleaners that fit the present air box. Sense 03 the cold air is gathered on top of the radiator behind the grille opening why would uou want to change a good thing? A 4 cylinder Camry is not going to show a big 1-3 horsepower increase anyway.
I own an 04 SE Camry with the high flower air cleaner element.