[streetpro]

Again, it depends on the definition of a massive spoiler. Because the rear wing on the trunk lid may reduce lift, it is rarely able to generate significant downforce because it is in the area of the swirled air. That's why DTM/GT cars have wings on high struts to get them into a "clean" airflow.
A splitter on the front will definitely help, both to increase downforce and to reduce drag (under certain conditions).
The lower openings in the front part of the engine cover allows a much higher flow through the radiator (the pressure difference between the part in front of the car, where the air is in positive pressure, while behind the radiator, through which it is slowed down and is further sucked under the car by faster moving air/low pressure zone - Venturi effect).
That's why M cars put transmission coolers etc in there, which would otherwise have to be in front of the water/air cooler.