The collector on the header is 2" OD, so no need in going any larger for the rest of the system.
Many people have used Magnaflow mufflers, with mixed results. There's just not many options for controlling the sound, and having a long life.
My 12A car has a RB header, and a single borla clone generic stainless muffler. A bit louder than I would like, but not obnoxiously loud.
My SE has the RB header/presilencer and some generic muffler. I think the muffler died a long time back. It's obnoxiously loud. Even the harley guys around here think it's too loud....
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