I noticed on my JDM engine that the oil pump(i think it is) is out side on the driver's side of the car. but my engine dosn't have it out there. so here is my question. Don I need to replace t with the US version one or could I just leave it there? I am sort of confused as to whatr it was but I was looking at some pictures and noticed what it was. Any input would be appreciated it a lot thank you.