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At idle all the exhaust runs through the full muffler and out the rightside tip. Once you rev the motor the valve opens and allows some of the exhaust to "bypass" the muffler. The golf tee mod allows you to stay in the "bypass" mode all the time. Since the turbos keep the exhaust quiet not much of a muffler is required.At least that is how I understand it. I could be wrong...
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