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.
Well this is what a lot of people have been waiting for. These sketches officially released by Nissan yesterday (and leaked a few days earlier) give an insight...
This was something I did a while ago. I realised that the hot air from the radiator fan blows directly at the air filter and this will cause the air intake tempreature to be high. I had a hose that channels air from...