Is there a site that lists the differences between release series?

 

wikipedia is my friend for that

 

^^ what he said.

But they're very minimal changes. Like custom paint for all 4 years (though Hot Lava has seen 3 release series models so I wouldn't call that custom), different grills, different stereo systems, etc.

 

https://www.scionlife.com/scion/xb/

 

Thanks, that was exactly what I was looking for