Preliminary Work

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Remove air cleaner housing.
→ 242419 REMOVING AND INSTALLING AIR-CLEANER ELEMENT .
Remove top half of air filter.
1. 2.1. Unscrew eight Torx tapping screws (T25 screw insert) on the upper part of the air filter.
  
  Fig 1: Identifying Screws On Top Half Of Air Filter
  Courtesy of PORSCHE CARS NORTH AMERICA, INC.
2. 2.2. Lift off top half of air filter -1- .
  
  Fig 2: Identifying Bottom Half Of Air Filter With Air-Cleaner Elements
  Courtesy of PORSCHE CARS NORTH AMERICA, INC.