I know everyone is sweating the Werks B5 and B6 on this thread and others, but the best Werks motor is the Team Line B7 Pro-C .21. That engine is crazy fast. I had one and it was ridiculous. It had good bottom and an insane top. I ran it with the 97t and the dynamite 007ht pipe. I'm waiting for that to go down to $199.(hint hint)