Fair enough though I found the bike had more low and mid range pull with NoCat headers. Initially I had a Remus set stainless set with the standard can. They look great with a really nice brassy patina and really improve the engine breathing. Then I found an Akraprovic Ti system with stacked cans so I swapped the lot and sold the Remus. It's not a difficult job.
Sorting out the fuelling further improves the bottom end and takes out the mid range torque dip. I now have useful power from under 2000 revs, but whiles its handy to have, I avoid using it below 2,500 revs, because I feel that those 600cc pistons can give the engine bottom end quite a bashing.