I would call dmv in Trenton and ask someone. PA requires titles to be notarized upon sale, but NJ doesn't, but im not sure how nj dmv will handle the transfer. I once bought a car from pa, and didn't realize it needed to be notarized, and didn't get it done when I got the title. But I had a friend who was a notary, and he spoke to the seller on the phone for an oath or certification or whatever he needed. Im not sure how legit that is, but this was about 12 years ago