[aerohead]

My opinion is,don't.Science says you'll never see a benefit at the gas pump.I used to use a Filtron-sock(pre-cursor to K&N),air cleaner on my race bikes when I was younger and more ignorant.Now I'm older and a little less ignorant,and while K&N's hype does speak to my intuitive side,the science does not bare out their claims,and I will use nothing but a micronic paper filter element as is standard on your Highlander.K&N has found a great way to sell cheap oil for alot of money.