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You are correct.
There is a sports exhaust that operates to bypass chambers in the muffler at certain speeds and rpm (although most will hack it so its always open). There are 2 different types, the earlier (with the bypass pipes being external) and the later one (with most of the bypass plumbing in the muffler)
From what i heave read the porsche sports exhaust is much quieter than the aftermarket sports exhausts (but im sure someone can confirm this). Porsche exhaust, like everything porshe is also more expensive.
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