Big Throttle Body for NMAX125/155. The diameter is larger than Stock, so the intake efficiency is improved. It is possible to use the stock air cleaner box and speed sensor. The speed sensor that is originally attached to the product will be the one to be set manually. If you use the Stock speed sensor and air cleaner box, the idling will be a little unstable, but the response will be much better in the middle and low speed.
It would be better if you adjust the manual speed sensor and set the air filter to large.