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I never looked at the muffler to see, but on my 35i M Sport with Performance Package there is one outlet from the muffler to the tip and it definitely has a vacuum valve on the right side. When it opens it is very clear this isn't the standard X5 exhaust.
Last weekend I happened to be carrying some long pieces and left the rear hatch cracked open. WOW! I have never heard it from the "outside" before, but the exhaust is even louder than I thought it was. Now the I6 isn't going to have the same growl as the V8, but the sound is a high pitched scream and it sounds really good I think.
Thought I would chime in as no one had made note of the 35i exhaust difference yet.
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