The CT20(b) turbo was used on the 3s-gte 4 cylinder, so it would have a smaller wheel on the compressor side. I assume the exhaust turbine would be smaller too, but I'm not sure about that.
I remember there being something weird about the CT20b. Isn't the exhaust side of that turbo cast as one peice with the exhaust manifold?
EDIT: Found my dyno video. (898 kb)
And here is my build video. (7.7MB)