you can swap the freehub body to a 9 speed (9 will accept 10 and 11, it's just named 9 because that was the highest tech at the time), but might have to change the axle too. the 8 speed exa looks very similar to the modern spline pattern, but don't be fooled: it will not take more than 8 sprockets. the newer freehub bodies have a different diameter axle, so you can only do the conversion with a 9 speed piece (usually they have "9 speed" written on them). they came on lower level hubs, so be on the lookout for a veloce hub from ~2000 and swap all the internals over
here's the freehubs campag made over time:
https://branfordbike.com/new-page-1/
you can swap the freehub body to a 9 speed (9 will accept 10 and 11, it's just named 9 because that was the highest tech at the time), but might have to change the axle too. the 8 speed exa looks very similar to the modern spline pattern, but don't be fooled: it will not take more than 8 sprockets. the newer freehub bodies have a different diameter axle, so you can only do the conversion with a 9 speed piece (usually they have "9 speed" written on them). they came on lower level hubs, so be on the lookout for a veloce hub from ~2000 and swap all the internals over