Welcome to the forum! An 1125 is a heck of a fun bike. They are pretty rock solid, if you have charging system issues there are fixes/ upgrades available, and use the correct oil that the manual recommends per it's instructions.
If you don't have a manual you can get a free .pdf download at Buellmods.com

Is it stock? Stock muffler? Make sure you have the matching ECM for that mod. You can buy one from IDS or get a free map from Buelltooth.com if you're the do-it-yourself type.