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Here is the TRD version that replaced the stock airbox inlet. The inlet sucks in the air through a hole behind the passenger side fender and into the bottom of the airbox. The TRD tube is flared at the opening, like a horn, and is supposed to help air flow faster and more efficiently into the airbox. Once the TRD inlet was attached to the factory lower airbox, the box was reinstalled into the engine compartment.