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i believe that no matter what test pipe or high flow cat you run, you will get a hiss/whistle at around 3000 rpm. everyone that i've seen with hfc/tp have
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Track Member
Join Date: Feb 2011
Location: NewYork
Posts: 968
Drives: 09 PG T/S/N 7AT
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i believe that no matter what test pipe or high flow cat you run, you will get a hiss/whistle at around 3000 rpm. everyone that i've seen with hfc/tp have the hiss. i've gotten used to mine so i dont really mind it anymore
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