so this is my theory behind this... someone correct me if im wrong.
with this your not moving your filter. your filter is still sucking in the same hot air. which is not dense because hotter air is less dense. so that means the filter can only suck in so much hot air. therefore your cooling only that amount of air. It doesnt cool the air coming in the pipe it cools the air already in there.
unless the amount of air is restricted by the cylinder.
2003 Focus Sedan - Sold but not forgotten
2014 Mustang V6 - Current