2mm will make the different already. More air to go in to the air chamber and combusion room. That's why some bore it until 64 or 67mm... After market TB like Jun is 70mm at inner diameter. But bigger doesn't mean better, big enough for ur engine OK lar. Don't tell me a stock b16a is going to put a 67mm or 70mm TB.
i nid ur help to teach me how to remove da front center panel of my dashboard as well as da cd player.. i plan to repaint da center panel of my dashboard which consist of cd player, clock holder, air...