I would suggest to get a good muffler you like (FYI Cheap Jardines are known to blow up though). IMHO If you want a mellow tone, look into Drummer, If you want full max go with Deans pipe (KEDA).
Then get a tune for the ECM. Try Buelltooth.com. The basic Buell RACE tune is usually good enough unless you want to spend too much time and trouble down the wormhole of tuning.
Or really, whatever... If it runs good now, I'd wire the valve open and run it.