On these notes, let me clear something up here. What Titan Rattler is saying is absolutely correct. The reason people want a bit of proof or validity, is because this is quite the modification, and he's boasting an extremely good gain.
We're not gonna go and "investigate" to try and figure out if he's some guy from somewhere else or anything like that. This thread is on topic of gearing, let's not change that. It's reasonable to think that he may get a dyno, speedometer clip, or someone to come look at it/ride with him. If a long time goes by and nothing comes from this, than oh well maybe someone else will attempt it one day.
Let's try to keep this about the possibilities and benefits of gearing.
Edit: some of you didn't seem to necessarily get the idea here.... If you want to ask him questions about the swap, how he did it, if he can take speedo clips, if he can dyno it, if you can come look at it, then great. But 10 posts to the equivalent of "i don't believe you" does not help anyone. If he legitimately did it, all it would do is discourage him to stick around and explain/prove things further.