Wow-that's a good question about the muffler. I seem to recall that it was straight through, with a baffle system surrounding the passageway. I know that he also sells the muffler separately. Why not give them a call out there-number is 520-836-1117, and talk with Patrick or his wife Danese. They are really neat folks, and have been very helpful to me with info. I think that they have some of the best pricing on their product line; you really do get what you pay for with a lot of restoration supplies. All the best...
