Prices from Harley USA, forgot the Donald tax so another grand.
Not sure what other costs are involved other than a Dynojet tune (which you’d have to do whichever way you do it) to get it running at its best.
My warranty ain’t worth piss anyway, brake discs are pitted (not under warranty), and I have a FP3 installed which HD sold me, but effectively nullifies the warranty. Personally I’ll be looking after it myself, the bikes a keeper and having seen them service my bike and under fill the gearbox, I’m more than happy to deal with any issues myself.
A BMW warranty it is not!
Most I’ll do to mine is throw a cam in it, doesn’t really need anything more than that imho, and I won’t be using a Harley cam, so again, warranty is null and void.