The OE muffler sound system was adopted from MY17. Since repairs at the Nissan Performance Center are expensive when malfunctions occur, we have developed a kit that can be easily repaired. This is a replacement part when the factory muffler sound system is defective. This product can also be used when installing a late model titanium muffler before MY16. This product is a type that is automatically adjusted according to the voltage of the air flow meter, and the initial value can also be adjusted by installing the attached switch.