K & N air filters are for :

People in a hurry on an engine coversion who don't want to bother to
engineer in a proper air box and 'real' paper element filter.  ( one
design goal  of the air box on all modern and semi-modern cars is to
subdue air intake noise - some jampanese factory installations have
branches of plastic tubing that 'go nowhere' ...their only purpose is to
change resonance in the intake track, thus further reducing noise. . )
People who like lots of intake roar.
People who think they will get 0.25 more horsepowerusing one.
People who don't care about having  an actual 'decent' air filter on
their engine-one that will work in real dust.
People who only drive on pavement in towns and like intake roar.

On 12/7/2012 8:13 PM, Richard A Jones wrote:
> Dennis:
>> Get those reusable cleanable high performance air filters. Get that extra HP
>> you can't feel and let that silica right in there.
> McNeely:
>> What are the "better filters that you refer to, where are they available, and how much do they cost?
> McNeely:
>
> It's Friday.  Joke!!
>
> K&N filters.  Good for the track when you intend to rebuild after
> the race.  Bad for the road because they don't really filter
> the road-stuff.
>
> I'll duck now before those with K&Ns start firing at me....
>
> But I had them 20 years ago on my 911T and I sure wouldn't
> put them on my Westy Syncro!  Think:  take a deep breath
> in a dust storm.
>
> Richard
>