Thread: Fast Intentions exhaust is here! (continued)
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Old 08-09-2012, 08:31 PM   #544 (permalink)
KaienZ34
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Originally Posted by djkyky View Post
I installed the cat back FI exhaust on my 2012 Z. There is a distinct annoying drone at 4000 rpm except when I have the windows rolled down. Why does having the windows down make a difference, internal pressure?

Do you have non resonated?
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