[Boxtaboy]

The S bumper will fit without any modifications, but you will have an ugly void left behind the center opening section if you don't add the center radiator. That void left will also suck in air to a section where it normally should not go (hence disturbing airflow), since it is blocked off with a base bumper. Therefore, I would either replace with another base bumper, or source an Aerokit bumper made for a base car that doesn't have the center opening.