An adapter for a pipe is disclosed where the adapter changes the effective inside diameter of the tube to increase the airspeed flowing through the area where the adapter is placed. The adapter is utilized in automobiles where to adjust engine parameters based upon the requirements from the various sensors. This allows original sensors to be used in pipe while providing the overall appearance of a larger section of pipe. A kit including a number of nesting adapters is provided to allow altering of the cross sectional area of the pipe. The location of the sensor is maintained in the center of the pipe and the adapter(s) engage, nest, or connect to cause a progressive reduction of the pipe diameter until the optimal air flow speed is achieved based upon the requirements of the sensor.