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I notice a bit of that sucking sound with my AEM, but definitely not a whistle. Make sure there isn't a gap where the filter attaches to the pipe - or maybe if it's an off-brand the whistling is just a design flaw.
I don't notice any big difference in sound when the vtec kicks in (compared to any other engine when you hit high revs) - I don't think it's much of a change, on the sohc at least.
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