From what I understand and have been told and have read... Japan's emission laws are very strict... and after 30-50k on certain engines, things have to be replaced or upgraded, and on some things it's not cost effective to do, so a lot of the citizenry opt to just replace their engines. That is what this company risingsun does... buy the replaced engine and resell them worldwide to less restrictive countries... there is a place nearby me, in San Antonio, that gets these engines, I'm pretty sure from risingsun, and resells them all over... I looked into it last year when I was replacing my first engine and did some research on these, that's why I found out. A very small percentage of these are from wrecks, but the vast majority are from just lazy cheap R&R's... it's seems since they do so many of them it's way cheaper and quicker in Japan to do an R&R... they are almost set up like assembly line work to slap 'em in and out over there, in and out in less than 3 days. I think they are a little over priced and it can take weeks to months to get one from them sometime, is what I've been told, they won't tell you that on the phone but, once they have your $$ they don't really care and make you wait.