Here's my stock answer for these fancy air filters:

-Go to a nice clean paved country road.
-Do a few seat of the pants, or better yet, timed acceleration runs.
-Pull your air filter out.
-Do the acceleration runs again.

Notice any difference?

Didn't think so.

-Don't forget to put your air filter back when you are done.
-Save money from not buying fancy air filter for or or



Bavarian Autosport sells stock air filters for $16.95 for the 4.4 l engine.