Putting new pipes on today, looking at my FP 4, the only options for a 2-1 exhaust are the pro pipe chrome/black and the stainless high output 2-1. Throwing on a lane splitter by SP concepts. Which one of these options would be the closest to flash a map. Bike is a 2010 Superglide custom.

 

Either way it will need to tuned on a dyno or at the very least by data!logging and applying changes to whichever map you choose. Those shorter cone shaped 2in1s will favor top end and be less than desirable in the lower rpms in most cases. If you're running any kind of performance cam I'd be surprised if there wasn't some significant reversion. Tho it appears to be multiple stepped headpipes?
I've never heard of that pipe so I don't know but I would look into any performance issues it might have by looking at dyno sheets of others running it. Of course it's too late now.

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Call / Email Vances & Hines they will point you in the right direction