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02-21-2011, 12:23 AM
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#8 |
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1NZ-6spd
Drives: '05 6-Spd Vitz RS Join Date: Oct 2008
Location: Oshawa, Ontario, Canada
Posts: 2,967
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That trap door is supposed to be a performance thing. It's shut to keep the car quiet and maintain back pressure, but when you floor it the pressure is supposed to open it up allowing better flow at the expense of more sound. It's a pretty good setup when it works for a stock muffler.
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