The TRD performance air intake system creates more horsepower and torque by bringing cooler, denser air, to your engine. It uses cool air from the factory production intake area behind the front grill, rather than hot air from the engine compartment. Featuring a low-restriction, reusable air filter in a special TRD designed enclosure, it's dyno-tested to deliver an increase in both horsepower and torque for better acceleration and greater pulling power. The TRD Performance Air Intake is 50-state emissions legal.