Ramair panel filters.

[Tazar]

Has anyone experience of these or can anyone suggest an alternative? I need to replace my old standard one.

[danb79]

Waste of time; stick with Mann / Mahle or Hengst filter and just swap it out yearly

I ran K&N, ITG and similar filters in previous E39s; expensive for what they are and they make no difference

[mmm-five]

The 'performance' filters can work in some edge-case scenarios, but for the other 99.9% of use case a standard paper/cotton/fibre/polymer one works fine...and has the added benefit of being relatively cheap if you feel you need to replace it every 5000 miles.

[g3org3y]

Agree with the above. Normal clean paper filter ftw.

[Megaflow]

Concur with what others have said, absolute waste of time.

I’ll be amazed if there is even an 10kPa pressure drop across the entire inject tract from filter box inlet to just before the throttle, or turbo, which ever is appropriate. Of which the filter is going to be insignificant.

Context, I used to do installation testing on prototype construction machines engine installations for sign off.