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.
anyone noe how to link our auto mirror to our alarm???when we arm our wheels alarm it will auto fold to close n when disarm the alarm it will reopen tat kind of DIY anyone???