Oh yes the infamous "dealer installed" "factory race can". It's maker and origin are unknown and seem to add to the mystique,mystery and marvel that seem to surround this muffler. Highly sought after and very elusive. Hang on to it FOREVERIt looks to me like the Buell Race Exhaust
The K&N's are lifetime filters and yes high flow as well. You simply buy what is called a charge kit made by K&N. The instructions will be on the box. You can pick the kit up at your local parts store [up]should the replacement be the K&N?