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No, I'm comparing roots 645 with roots 567 (both naturally aspirated) here is the sound I'm talking about:<a href="http://www.yardoffice.com/RR/DieselSounds/Track15Sample.mp3">http://www.yardoffice.com/RR/DieselSounds/Track15Sample.mp3</a> I've never heard a roots NA 645 load-up like that, it never sounds so "pulsating"  I guess you could sort it under nuances, but what makes the difference?
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