You know I think all the stories of K&N, BMC, etc. are a kind of urban myth; the standard by which all air filters are covered is a world wide ISO standard. All filters must be tested at and meet those standards, so this is where I get confused.

If all filters have a mnimum and pass, how can ones be worse than the others?

:confused:

i use k and n on all my stuff. the cylinder walls on my 951 looked pristine. i like it that i can pull it and clean it. as for increased HP, i cannot say. a 968 guy said that his dyno'ed with 4 or 5 more horses with the k and n. if you want, i can try to dig up the thread.

Ford engineers must have agreed somewhat...the cold air induction and the filter are factory. Filter is NOT oiled...it's paper.



http://forums.pelicanparts.com/uploa...1272943034.jpg

I have been using a K&N filter in my integra for about 160k miles. I like that I can clean it and re-use it. It has saved me a few bucks on filters, car still runs great, when the wheels fall off I will get something else.

After the K&N air filter the next best upgrade would be ceramic muffler bearings...or a Type R badge...

i already have a turbo badge. does that count?

I'm not worried and think it's a good product. K&N is a California company and the filters are made in the USA. The first thing I checked after the kid handed me the filter was to make sure it wasn't made in China.

Is it on the Discovery?

that would be rich. alas, no. it is on the 951. ;)

What's more, a cone filter facilitates the use of aftermarket cold air induction systems, which do make a difference.

The term, "cold air induction" is marketing hype. That is, unless your intake is connected to a HVAC duct in the cabin (don't forget to leave the A/C ON). It's more like "ambient air". The air temperature is whatever it is at the air inlet, which, BTW, can be equipped with either an open pipe or an air filter. Doesn't matter.

And notice that a cold air or ambient air intake has nothing at all to do with the type of filter installed either downstream or upstream. The inlet air temperature doesn't depend on where the filter is located.

Please lay that to rest.

Sherwood

Dang, I have the rain hat K&N filters on my carbs, there are no other filters out there (paper type ) that fit. Anyone have an idea?

This subject always brings the "experts" out of the woodwork... ;)

What about electric super chargers? :D

Electric superchargers, an overview.

This is exactly true. We should be replacing filters on a loss of power or on a differential pressure indication.

If you even mention his name, you WILL be voted off the island!

So the kids with the cold air induction pipes on thier Hondas are not really adding 10-15% more HP?

I had this discussion with a kid at a a/x one time. I told him adding a 18" piece of plastic with a cone filter on the end will not change the temp of his intake air. He didn't believe me...

good question.

Nope. Not true. vehicle manufacturers have their standards, but I can sell used panty hose as a filter material in the aftermarket without meeting any regulatory specs. Same with K&N or others. AFAIK, their "standard" test for their filter specs isn't the "standard" test used by OEM manufacturers. You will need to research the net for independent tests with various levels of objectivity for a better answer.

Sherwood