FMF Powerbomb "Moto" or "S/X"

I've been wanting to get a Powerbomb. Now that I'm ready to buy one, I've found that there are 2....? I'd like more bottom end and middle, so would that be the S/X? Other than that can both of them be used with the stock exhaust? Same diameter at the silencer?

Has any of you guys used the powerbomb w/ the stock can? What type did you use? Any big difference?

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