Why spin the air ? Spinning air provide a faster and cooler flow into your RAM pipe and Air Intake.
Steps.
1. Remove the fan
2. Cut off the middle part of the fan to create a round hole with blades attached
3. Use nail clipper, file the inside of the hole to make it smooth
4. Use nail clipper, trim the fan blades a bit (Especially if the blade is close to each other)
5. Stuff it in your RAM pipe. 3 inch.. should fit perfectly.
6. Use Double sided tape, stick on the wall of the RAM pipe to prevent the fan from moving.. DONE.. Test the difference.. If the car is sludgish... You need to Trim the blade more..