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Scott Helme on Twitter: "The new Power Valve system has a DDE (Dynamic Drone Eliminator) built in to control the bass/hum/drone inside the car. Loud exahust but without the annoying drone in
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No More Exhaust Drone!!! (TSP Dual Exhaust & Helmholtz Resonators) - LS1TECH - Camaro and Firebird Forum Discussion
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Amazon.com: AnXin 60mm Exhaust DB Killer Universal Motorcycle Removable Exhaust Muffler Silencer Noise Sound Eliminator : Automotive
![The cure for drone-- 1/4 resonance pipes aka J-pipes aka Helmholtz tubes - LS1TECH - Camaro and Firebird Forum Discussion The cure for drone-- 1/4 resonance pipes aka J-pipes aka Helmholtz tubes - LS1TECH - Camaro and Firebird Forum Discussion](http://www.cadillacforums.com/forums/attachments/2009-cadillac-cts-v-performance-mods/96693d1346186459-muffler-delete-helmholtz-pipes-v-exhaust-installed-c_sm.jpg)