Question about 2004 Lexus RX 330

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Trouble installing KN air filter in 2004 RX330

I ordered a K&N filter for our RX330. I confirmed it is the proper filter.
I just can't seem to get it in so that the airbox resets and aligns properly. The KN is a bit different from the stock filter in that there is a high and low side, whereas the stock filters gasket is in the center and the "top" and "bottom" are equal on both sides of the rubber gasket.
Also, the KN is not marked "front" or "top" like the stock filter so I can't tell which direction to face it (which may not matter) or which side to face up or down (which probably matters a great deal.
Can anyone help?

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  • kensterfly Jan 24, 2009

    I finally got it on but there's something about it that keeps the KN from being just a drop in.

    To Bunnydawg: There ARE some KN applications that require special duct work. I think these are for more high performance jobs. They also make a complete line of drop in replacements.

    Interesting that while I had the air box open I looked far down in the box and found a small piece of wood that must have been blown up into the air intake under the hood. I also found a completely dried out carcass of a small mouse. No telling how long that had been in there!


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If you run your finger around both side of the filter you will notice that one side has more oil on it

The side with less oil on it goes toward the throttle body

if you cant tell go contact k and n at (800) 858-3333 be sure to know make and model and year at time of call
Hope this helps

Posted on Jan 24, 2009

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If i'm not mistaken when you use the KN filters you also need to buy the special duct work for it too. might want to go to their website and confirm it tho.

Posted on Jan 24, 2009

  • Roberta Smith
    Roberta Smith Jan 24, 2009

    the love making nests... i had to take one out of the blower motor on my dad's van... built a nest and died... threw the fan out of balance and just about shook the dashboard off... please rate my suggestion solution.. not getting enough ratings and basically i'm a volunteer



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