:( Dudes, i am kinda new here. Need expert opinion. Well, I own a Wira 1.5 areoback. Planning to change my rims to 16 inch juz like Wira Areoback Special Editon. My frens advised me to change the Extractor to Putra 4/2/1 extractor and remove the cataylic converter and change the exhaust.... then there will be no prob in terms of pick up and speed it seems lah. Is this advisible ? And guys, i am gonna add in disk brake to replace the drum brake....do i have change the arm or can i get the disk it self separately ?