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Installation:
1. This Hi-Flow system replaces the Nissan Maxima OEM air box. Briefly, the OEM air box is held in place with three bolts (lower housing), support bracket bolt (behind the mass sensor), and a hose clamp (mass sensor). The air box itself consists of two halves the upper housing which attaches to the mass sensor and the lower half which attaches to the body frame. The photograph demonstrates the relationship of the units described. Not seen in the photograph is the bolt behind the mass sensor that supports the sensor.
2. The upper housing is removed by undoing the four clips that secure the upper housing to the lower half and then undoing the bolt behind the sensor and finally undoing the hose clamp holding the mass sensor to the inlet hose to the throttle body. Check that all electrical connections to the air inlet assembly are disconnected. They are the air temp sensor and the mass flow sensor. Note: Once the MAS connector is disconnected do not start vehicle, Check Engine Light will go on and need to be reset by dealer!!!
3. The photograph demonstrates the relationship between the mass flow sensor and the upper housing. If the upper housing cannot easily be removed from the inlet hose even after the clamp has been removed spray a liberal amount of WD40 or other similar light lubricant to loosen the pieces up.
4. Lay the upper housing assembly on a workbench and remove the mass flow sensor from the upper housing by undoing four bolts. You will be using.

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