Ivey Technologies, Plug & Play Speed Density Kit allows you to plug in our new harness which moves the intake air temperature reading from the inlet pipe to the upper intercooler pipe. This provides accurate temperature readings for a Speed Density based ecu conversions. The pipes that route to the Intake Manifold locate the flange where your current MAP Sensor is installed. (on the passenger side of car or also called Bank 1 is the one we replace). The kit comes with a prewired, loomed, and plug & play harness along with a Nissan factory replacement sensor that has an upgraded IAT & MAP sensor combined so your data is accurate..