10-10-2014, 04:54 PM
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#4274 (permalink)
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Ronin Samurai - Assassin
Join Date: Dec 2011
Location: Fayettenam,Pennsyltucky
Age: 68
Posts: 35,219
Drives: 2011 Nismo GM 6M
Rep Power: 2684438
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The hiss could be harmonics in the exhaust from the VVL changing positions. Best guess.
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