First, the only company to my knowledge that ever made a BB CT26 was MDCmotorsports. He only made 5 of them, if I remember correctly. I have one, mhopemk3 had one, and I don't know about the other 3.
It was an experiment that was never quite perfected. If I remember correctly, it was 60mm w/ a 10* exhaust clip. It spooled like absolute hell, and was so fun to drive. Mine ate itself in about 150 miles or so. I sent it back for a rebuild, but haven't run it since.
Man, was it fun, though. I was running 275/40/r17 Falken Azenis rt0615's on the back of my black car, and I would light them up right through third gear, but it was very controllable. With careful throttle input, I could make the car rocket from the line, or have a ridiculous smoke show without really even thinking about it. Foot wide black patches everywhere.
I gotta finish the new car. LOL. Memories!
That turbo will end up on my 7m swapped pickup, whenever I actually do the swap, as I'm doing w/ a t4 setup on the new car.