What year do you have?
Dyno tuning, according to my local dealer, requires a Power Commander module, however, they are not made for Buell XB's.
'08 and later have a learning ECM. My '09 XB12Ss adapted perfectly to the Hawk exhaust and K&N intake. Only an EBR race ECM could do any more for me.
Lots of Buellers on here can help if you want to DIY tune with ECMSPY if you have a pre-08.
BTW, If I lived in MA still, I'd have to have a stock exhaust handy to throw back on for inspection. They define "loud" as "louder than original equipment."