BMP Temp Sensor Adaptor for 800 E-Tec BMP-ETSA by BMP E-TEC Muffler Sensor Adaptor greatly reduces bogging out on long wide opens pulls. Works with aftermarket muffler, or stock muffler. This adaptor improves the problem with how sensitive the 800 E-TEC motor is to heat. The aluminum finned design dissipates heat to aid in cooling the sensor. Plus the simple adapter moves the sensor out of the extreme heat inside the muffler, allowing your machine to hold maximum RPM all the time.