was just speaking to a mob up here on the gold coast about it this morning. Didnt really understand what he was saying, but he said that they are not rebuildable, but can be highflowed and new T4 internals or something. He was talking around 1700 for this.
As I said, wasnt really listening or interested as I went there for another reason, so I didnt ask power figures etc.. but if you want to give them a call, look up MR Turbo in the yellowpages.