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Does the sound change pitch with the engine speed?
If not check out the purge valve for the charcoal canister. Unplug it see what happens. I had a similar problem. I let the dealer fix it for $400 but in retrospect it's easy to get at and only a $85 part.
edit: the dropbox link and the youtube, sound normalish. I have a 50i not M but it's pretty similar.
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