Just wondering? last time I was messing about with 2T bikes we ditched the Air filter & banged a ram-air or a K&N filer on, now is this still the way or is it best to leave alone & stick with a nice Polini/malossi filter for the stock box|? my planned setup is; 70cc kit- undecided yet Polini/stage 6/or airsal Yasuni Z or stage 6 pro rep scoot is a 2007 SR50R carbed