Not long since I put Mistral crossover and the titanium option cans from Guzzi on the greenie. New gaskets for headers, and tighten the bolts so I can turn them a little sidevice. The headers I think are the boss, the rest have to follow, and I use a lot of paste. I'm sure you know all this. But I think the wear marks are nugging you the most . You can put the Mistral crossover all the way into the headers for a nice fit, but then you are in trouble with the cans Can take a picture tomorrw, to show my fit together and wear marks. A few inches of piping woud have been nice, a few inches divided by ,,,, comes out in $. I woud have paid the full price.
Cheers tom.