That seems to be the idea used by JP Motorsports for their Qingqi exhaust can. Note on the photo of volksjagger's bike the pipe extension that comes with it. I don't think it looks as neat as mine though...the little "notch" cut out of the plastic sidecover is a small price to pay IMHO.

If you go ahead, ensure the pipe from Xian racing has a double diameter: 33 mm to engage with the Qingqi's 32 mm OD downpipe, and 32 mm to go inside the cans 33 mm ID inlet stub.