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The only times it'll be most heard is when you're on the pedal and the transmission is in between gears,otherwise everything should be performing A-okay
Have you upgraded your exhaust system and/or downpipe as I could see the whooshing reduced if those have been upgraded as the pressurized air may be less when entering the engine possibly,that's just a thought or the filter needs replacing.
good point about the filter ... how often would you bother changing it? It's looking a little gray these days, but I wouldn't say it looks filthy either... probably been running it for 20k miles... it's the 6637
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