When I bought this bike, it had a Leo Vince slip-on. Why someone wouldn't spend a little extra cash and install a full system is beyond me. I can't stand a job half-done. I found a good price on the headers, so I ordered them. It took six weeks for them to arrive though. I guess that's the price to be paid for handmade Italian craftsmanship (tongue-in-cheek).
I'll have a video up soon on the installation.
Here are the performance results after the installation.