i just listened to your clip. if your talking about that hissing during deceleration then thats not rasp.... poke a large hole in a hoonda exhaust and you have rasp. i have CNT test pipes and i have double that hiss.
during hard acceleration i hear more of what sounds like a sh1t load of air trying to rush out the restrictive nismo exhaust. no raspy, more air-y<< not a word i know.
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