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.
After weeks long of "monsoon" in the UK, we finally got the wonderful sun shinning. For this, I look no further but to visit the GTROC gathering here in London. p.s: guys reading this, sorry for not going for the...
im using e3 engine with minor mod..juz s90 70mm throttle body, 650cc injector, emanage, and 86mm sr20 piston, toda 1.5mm gasket, hks head stud.. izit no problem wit my engine if im using ar70 gt35 turbo with standard...