Big TP: I missed the 2nd part of your question. The bike doesn't need a reflash or upgrade for the exhaust change. I do recommend the ECM reset which is done by starting the bike from cold and allowing to completely warm up until the fans come on. ***Don't blip the throttle when you start the bike, just let the bike's EFI work from the beginning.*** [Note that this can take up to 15 minutes of idling, so be patient]