Thread: Strange hiss on acceleration with HFC
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Old 09-16-2016, 12:18 PM   #2 (permalink)
Trips
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Perfectly normal and no need to be concerned.

The stock cats hold back exhaust noise thats normal for the VQ engine.

By using HFCS's or Test Pipes it magnifies the hiss which is noticeable mostly on deceleration though.

Have Fun and enjoy your HFC's
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