PERFORMANCE MASS AIRFLOW SENSORS10 to 15 horsepower increase at rear wheelsOBD II Compatible 50-state legalOBD II Compatible. Works great with factory electronics and aftermarket chips or programmers. Innovative sensor features a state-of-the-art active-electronic module that provides improved control of both ignition and injector timing, contributing to the big horsepower gain at the rear wheels. 47% more airflow capacity than stock sensors. Sensor is housed in a high-impact injection-molded body to reduce heat "soak", a problem common to stock metal sensor. Installation of this sensor will not affect mileage or drivability under normal conditions. Easy to install in minutes. Instructions included. Please Note: These mass airflow sensors are very sensitive to oil, dirt and damage. Do not touch the wires or let oil or dirt get on them. Damaged sensors cannot be returned.