it's in the plenum chamber, just to the right of the battery when looking from the front of the car. Just remove the plastic cover, pull the filter out and Bob's your uncle. Incidentally, even though they're not mega expensive, you might be able to clean it rather than buy a new one. I left mine soaking a bowl full of hot water and washing powder for a hour or so, then scrubbed it out with an old toothbrush.