Thread: Weird Hissing/Air Noise??
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Old 04-20-2015, 06:57 PM   #5 (permalink)
Sales@F.I. Inc.
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Location: Simi Valley, Ca.
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Drives: 2008 G37S Coupe
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OP: It is quite normal to hear a hissing sound on deceleration once adding high flow cats or test pipes. It is the natural harmonic of the VQ37VHR motor. The sound is more prominent once you remove your restrictive OEM catalytic converters.

Please give me a call if you have any questions.

- Kevin
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