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.
Hi Guys,Is there anybody using haltech e6x for E8.... Where or any forum can find the base map setting ??Hardly can find on net not like those nissan or rotary one....? Or any one willing to share out?? ...i just wan...