Holy hell, they must be turbo? Can you recall the exact bike, how many CCs, any forced induction at all, n2o?
No fancy tricks, just standard bikes - don't forget that these things are extremely light. I think the ones he was looking at that do that are some of the 1000cc Triumphs and Kawasakis.
I know he wants to go for a Triumph Daytona or a Triumph Sprint RS, but can't remember if those are the ones he was talking about.