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There has never been any quantitative data released on de-snorkeling. All the info. is, to-date, just anecdotal.
The snorkel's intended purpose is to meet noise abatement laws in some countries, especially Switzerland and it was included in models for all markets (since the legislative environment is always changing).
My personal opinion is that it neither positively or negatively affects performance, but greatly improves the intake sound of the motor. My car is de-snorkelled.
Plus, if you're careful and don't damage it on removal, it is totally reversable. So there really is no downside to trying it.
Cheers!
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