I guess it's possible to turbo just about anything!
Bear in mind the bigger the turbo (more hp), the bigger the lag - which would be an absolute nightmare and possibly lethal on a bike!
I believe there is a 600cc 'bolt on' type turbo charger available - but obviously it's pretty bulky so finding somewhere to fit the damn thing may be hard if you still want to be able to lean into corners! Upgrading all your gaskets would be essential, too!
For reference, a 444cc rebore will cost £600 - £1500 depending whether you do the work yourself or get a garage to do it, and it will get you to between 80 and 90hp at the rear wheel.
That's easily enough to stay with a 2002 ZX6-R in a straight line.
