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.
Things might be top of the stakes for their production cars with the 1M Coupe on the way as well as the brand new F10 M5 but on the circuit it’s a bleak affair for...
yet again my engine has failed..have a 4g63 and when opened up the head found 2 pistons cracked and 1 fella rusted on top..on cylinder 3....
a nasty scratch was noted inside the blok...arrrrrr!!!