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I just purchased a "mint" condition 99 LX 470 from the Lexus dealer. The vehicle has only 80K and is in showroom condition. I'm amazed at the vehicle's condition. It's flawless!! You literally could not believe it is a 99 model. Anyhow, my wife and I love it, but I was wondering if anyone has added a aftermarket K&N air-flow system to replace the stock airbox system and if so, is there any improvement in performance that is worth the cost of the K&N system. Love the site...very informative!