![]() ![]() The O2 sensor does not function under engine load (acceleration & full throttle). The O2 sensor makes the vehicle run lean during idle, low RPM and steady cruise. The stock O2 sensor is an emissions compliant component that keeps the vehicle running at 14.7 AFR (which is lean) only during light engine load conditions. Just because your stock exhaust system has an O2 sensor in it does not mean it is self tuning. I HEARD I DON’T NEED TO TUNE BECAUSE I HAVE AN O2 SENSOR WHICH SELF-ADJUSTS, RIGHT? Given that, your motor will still run lean and requires proper tuning. The biggest increase of airflow will come from the less-restrictive aftermarket muffler(s) and not the head pipe(s). DO I HAVE TO REMAP/TUNE EVEN IF I’M JUST BUYING A SLIP ON EXHAUST AND NOT A FULL SYSTEM? In doing so, this will allow you to eliminate the lean issue and bring your motor back up to having a proper air/fuel mixture. When we refer to proper tuning, we are referring to adding enough fuel to compensate for the added airflow. Hotter motor temperatures and a whitish firing end of your spark plug are also good indicators. Generally the tell-tale signs while riding are popping and backfiring, especially on deceleration. WHAT ARE THE SIGNS THAT MY MOTOR IS RUNNING LEAN? It is never a good idea to run a motor or our exhaust at higher-than-normal temperatures since it can lead to failures down the road. This leads to increased overall exhaust and motor temperatures and also decreased overall performance. When a motor is running lean, it is not getting the ample amount of fuel that it needs to function at its best. Running lean generally means that your motor is not getting enough fuel to balance out the added airflow and equates to your motor and exhaust system running at higher-than-normal temperatures. When the air/fuel mixture is changed, your motor will have a tendency to run lean. WHAT ARE THE IMPLICATIONS OF THIS AIR/FUEL MIXTURE CHANGE? This changes the air/fuel mixture that is set up for the stock exhaust system. Also, generally the mid pipe and head pipes of most aftermarket systems are larger diameters than stock which allow for added airflow to pass through quicker. The aftermarket exhaust is designed to allow more airflow to pass by significantly less restricted than the stock muffler does. When you put an aftermarket higher-flowing exhaust on a vehicle, it throws off the current air/fuel mixture that the vehicle is setup from the factory with. Yes, you need to properly tune your motor. ![]() THIS IS THE FIRST TIME I HAVE PURCHASED AN AFTERMARKET EXHAUST. ![]()
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