Well i don't know why the engine makes that sounds but yes it does. I have Ark r spec resonated hfc and it's makes the hiss in deceleration. I almost can't even hear it but the more you open up your exhaust the louder it gets. I had a 350hr with headers and straight pipes. The hiss was loud
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PW 07 HR350Z R.I.P. Totaled by 82yr old woman 
2010 40th Anniversary 370Z
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