I copied the design from johnson lam at touge.com.my and install it to my ram pipe for my open pod intake. According to johnson the vortex will take effect during high speed driving (above 100km/h) hopefully it will create few HP during high speed driving :P
Just need to cut the fins of the fan a bit and install it to my ram pipe. Remember to cut the center hole too; to let more air going in.
Hopefully it will generate vortex effect during the suction of my carburetor.
My cold air intake which i installed it few years ago when i change into open pod intake.