If you point the intake for the air cleaner so that it points forward into the air flow, then the faster you go, the more air will be rammed into the opening, from the speed alone. And this increases hp output.
It's like a air intake but the fliter is shorter. Thiers a fiter a long you've need from metal or plastic connect it to the intake port and that's pritty much what it is it filters air
It is an intake filter that takes advantage of vehicle motion to increase pressure on intake while the car is moving in the seek of more power. You can use a car performance simulator[1] to virtually try different setups on your car and see how it would perform with different mods like this one
