im using one of the extractor from wei yip its a 4-2-1 with twist in the end to play with the air n added bullet...the difference was very significant n very the satisfied with it... but now i need to kno what kinda air filter should i use since im drivin a 97 carb satria, i was thinking of tht whole open pod with covered box n pipings but was told on another forum tht it is just a waste of time....any recommendations as i really need more low end power n if got high end will also be a plus point....