I have a 2000 Indian Chief with a performance core I bought from the dealership. I am running a S+S 561 cam with a K/N air filter. My question is how many discs should I run with an open end cap or the closed end cap? I still have the stock core along with performance core. Does Super Trapp still make the stock Indian (logo) muffler bodies? Trying to keep the stock look with the fish tail end. Thanks for any help.