After watching the videos...I think it does have to do with your test pipes.....I don't have them and planned on not doing them cause of the sound. I hear the hiss only under 2k rpm on yours...almost like a little blow off sound.
Can you post pics of yours connected to the test pipes?
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2012 370Z BLACK EDITION/ FLT BLK Rays / 5% 3M Tint / DW's / Z1 SS & 2 Piece Rotors
Nismo S-Tune OEM / Beluga CBE & Y-PIPE / DDX370 / GTR Start .4 Fluid / NST Blue Kit
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