if you want great coustomer service, go on their forum and talk to ron, normally he will answer questions very fast, the 3865 does support a wide range of vehicals, and engines, last time i updated mine it even said it had a diesel tune, however i think your are right about it not supporting all the smaller engines

 

the 3865 will not do deisel i tried and ron is awesome at support. They even have unreal phone service i called asked a question and was called within 1 day with my answer i love the tuner and would recomend it to anyone

 

Best way to ask anything of Superchips is their forum I've found. RON@SUPERCHIPS is quite helpful on there.