Beat me to it fonty. I dont notice any power tail off at top end (I have been clocked at over 120mph - but my speedo was disconnected at the time ). I seem to remember Jamie saying that the clock stops at 180kmh but the bike keeps pulling, mine revs right out in 6th.

Here is the my post before this edit:-

You should be able to get near the 57 bhp quite easily without any fancy wire splice or HRC card. You just need new pipes and an MC21 flywheel. Maybe the airbox mod and re-jet, however mine is making reasonable power (around 55)without the airbox mod and the rejet.

http://www.tyga-performance.com/pages/MC28.php

Tyga got 58.5 without any wiresplice at all. I have a HRC card for mine but I dont like the idea of cutting the loom so I went the MC21 flywheel route instead, it certainly made a difference. You also keep all the standard warning lights and speedo which can only be a good thing. I also have JHA exhausts.