I have a Turbosmart Plumb Back (not sure if 32 or 38mm) routed back to the intake on my GTM Stage 1 kit, and I’ve never noticed any flutter. You can adjust spring preload and see if it helps the flutter.
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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
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