it should just fit as standard if you are running the standard cooler
as it has been pushed back to fit, then yes you will need to trim it. Best way to trim it, either with a blade from a dremel multitool, or the usual small saw. Cut it bit by bit so you dont cut off too much
best way to say is loosen the pipe from the IC pipe onto the throttle body pipe, and place it over one another to see how much it overlaps - this will give you an idea of how much you need to cut away