When I bought my 2003 Heritage Springer, it had some fishtail streight pipes on it with no baffles. I didn't like the way it popped and backfired so I put the stock pipes back on it, but never looked inside them. I had the same problem as before with popping and backfiring. I even replaced the exhaust gaskets and the intake rubber gaskets to make sure I didn't have any leaks. Last night, I put a flashlight up to the pipes and realized they are completely empty. I can just see some small strands of fiberglass or what ever stuck to the sides. What would you all recommend as a good baffle to put in the stock muffler? I would like a deep sound but I don't care about being really loud. Right now, they are so loud that I can't hear anything but the pipes. I have the Screaming eagle stage one download, K & N air cleaner upgrade kit, and the TFI system on it now.