are asking if they fit or just performance
i am pretty sure they will fit k6 header even fits Y2K models
about performance there isnt much difference on these headers, other then they are lighter and stronger and gonna last longer they
remove your exhaust valve and get that sorted lots of info on here
different air filter and get a decent full system if you want more and get it tuned

 

I know there wouldn't be much in way of performance but rather for the weight savings. It's for my track bike and trying to squeeze the last I can out of it without breaking the bank. I would prefer an aftermarket header but not trying to spend $400 plus.

 

Different oil sumps on those bikes, so that's one the reasons why it won't work.