First off, I love my 2006 hayabusa. I've been hearing people say that it's the world's fastest production motorcycle. But from what I've read, the R1 and the GSX1000R have around 180 horses, are 150 lbs lighter, and redline at 4000 rpm's higher. So is it true that the hayabusa is the fastest, or is that just a rumor that's been going around?