Far as I know its all stock. I have put in the Victory "performance" air filter. Other than that I am thinking just some mufflers. I would imagine if the stock ECM needs a flash that would have to be a dealer for I sure dont know where the connector is or how one would go about that. Kind of a catch 22 thing on fuel. If you richen it up to cool things down engine wise, it makes the CAT's hotter. If you lean it out, good emission wise but make engine hot. Cats cool some because they dont have to "burn" excess fuel.