Not sure on the Highlander, but I've tried several types of filters (K&N, Injen, AEM, etc) in many vehicles (volvo, tacoma, tundra, etc) and they ALL were hurt in the performance and fuel economy department. The only filter that MAY hold some weight is the Volant, but it would take a long time to regain any finanical interest in the intake, so I'm gonna go with, "not worth the time or money" on the intakes.
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