The list I've come up with from years of using, asking, reading & debating.
-NGK Copper plugs (or Bosch copper)
-Mahle, Mann or Wix oil filter
-Meguires #26 pure yellow carnuba...Final inspection between waxings
-Standard OE air filter. Over on the 911 board a similar dyno run was run and a decrease in HP was realised with the K&N.
PS: Please dont ask about the ERAM electric supercharger.