K&N Air Filters - Any opinions?

supercharger maybe,and well over 3k,turbos for certain cars meet 3k.

I wouldn’t touch them for anything except a beater.

You will never know until you try it. If the money isn’t needed for anything else, it won’t hurt to try it. Maybe. If you can’t hold back, go ahead and try it. Don’t bother if your current air filter resembles it in any way, or if you have a full sized truck with an enormous filter.

Reason won’t have any effect on the people who want to buy these things.

Admitted amateur, glad to see you are involved in the discussion. Check out http://www.knfilters.com/filtercharger.htm

It is K&N’s website. They have a really good guarantee, but, you have to read all the way down to see it. It’s a great product.