Hey dimitrios, is the harness the one that leads to the catalyctic converter to the engine harness? I need one that starts from my catalyctic converter o2 sensor that leads up to my engine harness ( mine is too short, i'm missing about 2 ft.
its for mounting the second o2 sensor further down the exhaust system. the stock protege second sensor is located in the j-pipe. since the first cat on the msp was behind the j-pipe, mazda used this extension to move the second sensor further back into the mid-pipe. you only need this part if you install a header on your protege and want to move the second o2 sensor to the midpipe, or if your stock msp harness extension is busted.