It is a pleasure to share my information (and bike) to a lot of people with a similar passion. I own one of the few 1200's that was made for the 50th Anniversary of Honda UK. They originally wanted to sell 50, but as the bikes were built only on order and deposits paid ...only 25 were ever built.
Standard 1999 models were used, and was stripped totally. Except for the bore size that was changed, they also did modificatons to the cylinder head, electronic management system, removed a few pieces from the inside that lessened the weigt but also gave a few horses more ...(balance shafts. rods and gears) Most of the modifications is linked with HRC that used GP technology with no explanation or specs.
Rear suspension spring were relaced, power commander and exhaust system followed as well as the standard spray job for the 25. They were only marketed in the UK and Europe so very little is known about them.
It is horribly strong, extremely fast and with race track perrformance. On a Dyno after a recent service readings on the Dyno was 205 bhp and top speed of 354 km/h.
Only drawback is the G-force that slides you back and off the handlebars... and the amount of Hyabusa owners that want to race. Incidently ... I raced it a few times but only from rolling at 250 ...and then just opening up in 6th gear. Compared to the Z1400's, Busa's and other Birds it is like shifting two gears down.