Hi there.. I just got my Viva 850cc recently.. i'm not satisfy with the pick up.. so i changed the air-filter to knn open pod.. but the performance is poor, top speet drop and also my fc increase .. then i ask some of my friend why like this,, they said must change the extractor also.. is it true? anyone can give me some advise how to modify my viva pick up yet the topspeed and the fc maintain..?? i just need better pick up..

your advise will be greatly appreciated..