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It's been said many times, but I'll add that with the hood open, and plenty of cold air supplied by a 4000cfm fan, an N54 will gain 8whp when you remove the air filter alltogether on our Mustang MD250 dyno. It's repeatable: filter out, +8whp; filter back in -8whp. This doesn't tell us everything, but it lets you know the kind of upper limits of gain an intake can produce.
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