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Call them what you want..... When you direct flow inside a muffler, I call it a chamber. Straight through is exactly that, straight without blocking or directing flow. A dyno test of a true straight through vs. directed vanes or chambers on a turbo engine will show a true straight through offers significant more power.Not many B&B mufflers on my customers cars around here, I have pulled a few off to replace with better flowing mufflers. I have friends in other car communities that use to use B&B, and on Porsche's they have a insane failure rates. A Google search might surprise you.
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