I installed Berk HFC's over the weekend to a Nismo exhaust and have some bigtime hissing/resonance going on. It's pretty loud, especially when the exhaust is cold, but gets a bit better as it heats up. WOT it's still very prominent though... plenty of clearance all around but it sure sounds like its almost metal on metal at mid-full throttle, could it be coming from the flex pipes? I had the exact same sound with my 350Z and Nismo exhaust too... althought not as loud now. Kinda a drag because the exhaust sound is very nice, just seems there are some angry King Cobra's under there somewhere lol.
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