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.
Bless up. I have a problem with my 1998 Daihatsu Move L601. I changed my car from Automatic to Gearbox, after that convertion the car cranks but no spark from the ingition coil.
it all started one night at traffic light. that time just drag the car up to 0.5 bar and the check engine light lit on. thought it would just be minor thing and would reset by itself on my next engine startup, i...