Turbos definitely reduce exhaust noise....they're busy convertin the noise and velocity of exhaust gasses into more power for your engine!! 
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\"If I had a diesel rig, with a big ol\' blade, courtesy would reign, arguments abate, cuz everyone would know, I\'d SQUASH \'EM LIKE A GRAAAAAPE!\" -- Heywood Banks, \"If I Had a Bulldozer\"
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