hi again, Does anyone have any info or know about an upgrade oil pump by nissan..it goes by the name rev up and they say that it is a must if rebuilding ur engine or if u r FI...my buddy has one that he doesnt need and asked me if i wanted it...i am supercharged so i thought it might be useful...how difficult it is to change the oil pump and do u guys think it would be worth doing..tks all