Your running whats known as a 2 into 1 exhaust. I run the same setup on my bike but with a gp can instead of a full size can like you probably have. It all depends on what you like better 2:2 or 2:1. There is more tuning that needs to be done with your setup because there tends to be a flat spot or dip in the power through the midrange. With proper tuning you can fix that. I've noticed that with the small loss in midrange you gain some up top though. Only problem with that is the 51 being the type of bike it is benefits more from having good midrange over top end.
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