down here you can do a diesel swap, just keep it pre 97 on swapped to and swapped from, otherwise its federal diesel smog, in cali, a group of two or three guys passed around a pre 97, post late 80s engine (had to be newer then rig swapping into, older then 97) they passed it around for the ref to tag it diesel, then put in a tdi engine. so paperwork shows legit vw diesel swap, open the hood its a vw diesel. lol.