I was thinking the same thing. Just bought a 40th Anniversary with 23k miles. And it almost sounds like an exhaust leak from where the headers meet the exhaust. I thought I was going crazy but my brother and a few friends noticed it too. Putting it up on a lift soon to check under there and find out for sure.
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1991 Nissan Silvia KA-T Coupe/1998 Nissan 240SX - SOLD
2004 Suzuki SV650 - DD/Track Beater
2010 Nissan 370Z 40th Ann - DD
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