Wow i have a 08 9sx and i have no problem topping 110 mph if i want to. I don't so it's not an issue. The drummer exhaust will work fine with a stock ecm. Also EBR has a programmable ECM for the 9 but it's $750. If you wanted a super fast bike you should have stuck with you're Bussa or grabbed an 1125. you bought a bike made for riding in the city. Hence the name City X. It is quick off the line and turns as well if not better than any Buell out there.
If you don't like it sell it but trashing a well made machine that is Great IMO is plain silly.
Good Luck!