Intercoolers are not as big a restriction as everyone seems to think. Stick something like a hairdrier at one end, (which will burn out with airflow restriction), and you find that it'll happily run, without dying. Have I don't this yes. Why, to dry out a cooler that we dipped.
A N/A engine, will in no way, become "laggy". Commonly associated with turbo cars.... It's not going to be nothing, then, BAM! Power.