Denny,

   I have always had K&N filters in my vehicles. The performance difference
is minor but you never have to buy another air filter again. I did notice a
slight difference with the full kit on my current truck.

Maybe you should have asked the question before you bought the K&N filter.

Denny,

Although I don't have any direct experience with the K&N filters, others on
the Toy_Coma list have had problems with MAF sensors going out because
either the filtration is poorer or through oil contamination.

This could be due to improper cleaning / over oiling but I know at least a
few of the list members have jettisoned the K&N in favor of the stock setup.
--
Mike Harris
Austin, TX
List owner, Toy_Coma
autos.groups.yahoo.com/group/Toy_Coma/

I've tried K&N filters as well as oiled foam filters.
-I've found no performance improvement over a top quality
conventional air filter.
-I don't like the mess of cleaning and re-oiling the filters.
-In one car the K&N allowed dust past the filter.  The downstream
side of the airbox was dusty, so dust certainly went into the
engine.  OEM filters never allowed dirt to pass this way.

I stick with OEM or top quality aftermarket conventional filters.

Ken

I used a K&N air filter many, many years ago (the car is long gone) and
didn't really notice any difference.  Of course it was more reliable
than traditional paper filters (the K&N filter is probably still in my
1987 Daytona Shelby Z), but I didn't feel it was worth the hassle of
cleaning and the initital monetary investment.

Just my 2 cents,
Eric

Yup oil them too much and there goes your costly MAF sensor!

Put a K&N filter on my 88 V-6.  Failed emissions; both NOx and
hydrocarbons were high, which according to a mechanic are mutually
exclusive conditions.  High NOx is from high exhaust temperature and
high hydro's are from a cool exhaust.

Since I had too many vehicles with rusted bodies at the time, I wound up
donating it to a charity for budding mechanics to practice on.

Afterward I researched oiled filters.  Will never own another one.