Whoa, those K&N filters are pricey /ubbthreads/images/graemlins/shocked.gif
Over on the Rennlist 911 forum, there is a lot of doubt about the claimed extra bhp from fitting K&N. I had one in my 964, but replaced it with the stock paper filter. Some even say that the K&N let through too much crud. It's a hotly debated topic, and you need to wear flame retardent suit if you offer an opinion /ubbthreads/images/graemlins/grin.gif
I had a devil of a game prying the covers off the filters ... and inside there was a lot of glue holding the concertina filter paper in place, so I can believe they were sold as a complete unit.
Not sure what to do, really. I don't want to pay K&N prices at this stage ... maybe once I get the car really nice I could justify it. But right now I just want to get it operating correctly.