What's the story with the Go G5T? Is this a powerful engine?

I'm keen on an Alpha A852, but there's a great offer going in Germany for the G5T including 2072 pipe..., for way less than just the A852.. I want power though. Kinda' keen on the hard ano 2072 the Go comes with as well..

(If I understand correctly, the 2072 is a big power pipe that goes well on lots of engines....)