VQ Hiss or other rattle?

Tractionless

I developed the hiss which sounds like quick metallic rapping imo like a leaking exhaust gasket, immediately upon installing high flow cats. I brought it to my exhaust guy to verify none of the gaskets were leaking, they were not. Luckily mine only happens for a couple hundred rpms around 2000 rpm during decel.

From what I've read ,it culminates from the headers/cat area where the sound is actually produced and heard so it doesn't matter what else you have installed downstream as the sound is not coming from the tail pipe(s). Seems to be exhaust pulses hitting the exhaust piping walls in the component bolted the the header.

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Toys Not Tots

Averying

Yep sounds about right. Seems like ART pipes help with the resonance chambers. Haven’t yet looked to see if it still occurs with long tubes but I imagine so.


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2009 Sport Touring | Platinum Graphite | GTM Stage 1 Supercharger | BC BR Coilovers | Hotchkis Swaybar | Z1 FUCAs | AME TM-02 Wheels | Z1 2-piece Front Rotors | Z1 Clutch & Flywheel | Invidia Gemini Catback | GTM Resonated Test Pipes

Tractionless

Would be an interesting poll to start to see what exhaust components produce the hiss. Mine are FI resonated high flow cats bolted to OE exhaust manifolds. Wonder if the long and short tube owners experience the same.

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Toys Not Tots

Rusty

FI LTH's, 12" resonators, FI cat back. I get the hiss every once in a while.

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Averying

The hiss I’ve got is so noticeable every time I decel below ~2500RPM. I’m still convinced there might be parts rattling on decel but I’m going to try and live with it and tell myself it’s normal haha


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2009 Sport Touring | Platinum Graphite | GTM Stage 1 Supercharger | BC BR Coilovers | Hotchkis Swaybar | Z1 FUCAs | AME TM-02 Wheels | Z1 2-piece Front Rotors | Z1 Clutch & Flywheel | Invidia Gemini Catback | GTM Resonated Test Pipes