5 out of 5. My air filter was mangled and needed replacement so this was a great option for me.

I enjoy the sound upon WOT. Sometimes it's too loud for me, at half throttle, but that's ok, some still enjoy it :). I don't hear much more turbo whizzing, which was the main reason I purchased -_ the turbo gets drowned out by the exhaust system I've got...

My air filter was mangled and needed replacement so this was a great option for me.

I don't think it's fair to say that this will give any real performance gains on a stock 9k. This went on my '96 9000 aero.

Now to make a small heat shield to keep out heat from fender area where the filter sits...

Rating: [5 of 5 Stars!]