Next I removed the muffler which weighed in at almost 8 oz. I thought I'd be smart and peel open the crimped edges of the muffler, gut it, and then braze everything back together. After a significant investment in time prying and twisting I got the housing apart only to find a second slightly smaller muffler inside. They were apparently going for a dual chamber approach. Each of the two chambers weighs in at nearly 4 oz and has the same exhaust port opening. This means there are 2 mufflers to work with. I may go with a larger design to reduce back pressure and noise.