Factory replacement filter, direct from Porsche.
Porsche recommends checking the air filter every 12,000 miles, and replacing it every 24,000 miles. Make sure you're not choking your engine for air!
Fitment
Turbo or Turbo S - 2001-05
GT2 - 2002-2004
GT3 - 1999-2008
GT3 RS - 2004-2008
File photo shown.