YOU NEED TO HAVE MASTERED THE WALL JUMP TECHNIQUE TO GET THIS UPGRADE. When you enter the Chun-nan's entrance stage during the day, move forward a bit and the cutscene will trigger, showing you where this upgrade is. You will find two close walls on the left hand side with a trail of rings going up.
Perform a wall jump to the top and grab the upgrade. Then do a high jump () and hold to perform the Air Boost. Copied from ps3trophies.org.
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