I plan on purchasing a SuperMeg soon for my 08 FXD. The engine is stock. How many disc come with the pipe? I will also be installing the Vance & Hines V2 high flow air cleaner at the same time, then take it for the short ride to the dealership for a Power Commander install and tune. What is a good starting point for disc's with the end cap that comes with the pipe, how many disc come with it, and finally, I will most likely want to go with the open end cap as I listened to a similar engine today with an open end cap and LOVE the sound, would the 9 disc pack be a good starting point with the open cap? Thanks for your help in advance.