I have not seen a single 4-1 Yosh replica exhaust that is compatible with the center stand -- other than the picture you linked. IF YOU GO WITH CARPY, confirm beforehand (preferably in writing) that the pipe he is supplying is compatible with a center stand (as pictured). To do so, the pipe MUST offset to one side of the frame. The MGP and Lossa pipes do not offset like the one pictured.
MGP
Pros: highest quality (spring mounts, 2-piece) and comes with baffle
Cons: no mount for the end portion of the pipe
Lossa
Pros: good quality and design (2-piece) and Jay will provide a baffle,coating and mount upon request; no production number limitations
Cons: no spring mounts