Im really surprised -- my CNT resonated TP's were awesome.
A bigger Y pipe might contribute to it.
Also, what I'm annoyed by is the hss or rasp on coast down -- is that what you are talking about, because mine never did that although my unresonated TP's did.
Maybe an exhaust leak? That will greatly affect sound, especially when the pipes are cold.
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Enjoy it. Destroy it.
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