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, guyz...
do any 1 know any different between evo4 n evo6 engine?
they said tht evo4 engine always having problem with de oil pump n the piston oso not long lasting, is tht true??
btw can evo9 clutch fit with my...