Hopefully this won't end up in the orphans but has anyone used a K&N air cleaner on their car's engine?

These filter elements are pretty expensive compared to the usual paper core ones we see at department stores. These are made of washable linen and are advertised to last for the life of the car and allow better air flow and a slight increase in performance – the last filter you will need to replace. Clean it @ 50,000 miles. They cost about $60.00.