A Yoshimura ECU will allow you to raise the rev ceiling.
I'm not sure if they've done it with that particular model year, but I know guys have hacked other version of GSXR stock ECUs. They come from the factory with alot of features locked. Increasing the rev ceiling is one of the things that can be modified.
Here's a thread about it being done on the 05/06 GSXR-1000 specifically and some of the stuff that's done.
http://www.gixxer.com/forums/showthread.php?t=207938