what are the chances of fitting an '08 10R slip on exhaust on a '05 model?

 

If you want the same look as the 08 on the 05..Your chances are SLIM to NONE due to the fact that the header is complete different. Now if the 06-07 header fits the 05 then your chances is VERY GOOD but you still need a shop to work with you..I know what you mean bro, wanting to customise your ZX10 different.. I'll post my custom pipe when I get the camera going. GOOD LUCK!

 

I do not have the measurements as far as fit goes. Then you need to consider how you can adjust the tune if needed. Honestly, a slip on is just a slip on.