I talked to a Harley rep and he gave me the story.
The EPA certification is model/engine/year specific.
The 2017 w/the 107 is certified with EPA.
The 2018 with the same engine and the same bike requires a separate certification.
The 2019 with the 114 on essentially the same bike requires a separate certification, and on and on.
Even though the 114 is used on the 2019, since there is no certification for it's use on the 2017, Harley won't sell the engine or the upgrade while the bike is covered under the factory warranty.
Of course, if your bike is out of warranty you can do anything you want.
I asked him if I update the engine using Screaming Eagle Stage III parts and Harley labor, would it still be covered under the ESP.
He said it's a gray area and would depend if the dealer wanted to "look the other way".
I guess the official answer is no with a wink.
I asked if Harley was planning on certifying different year Trikes with different engines and he said probably not, if someone wants a 114, Harley wants them to buy a new bike and not just upgrade the engine.
I talked to the dealer about a Stage III upgrade and it would be around $5200 parts and labor, guess I'll keep the 107.
Thanks for the replies
Jon