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Old 03-14-2012, 05:01 PM   #4 (permalink)
corbin09
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Join Date: Jun 2009
Location: Dallas tx
Posts: 665
Drives: 370z
Rep Power: 280
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The resonated test pipes, or any test pipes at that would make the sound you are hearing more noticeable. It is just a scavenging affect in your exhaust, and on Z cars its normal.
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