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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
What Is Exhaust Drone? | How to Fix Exhaust Drone
The cure for drone-- 1/4 resonance pipes aka J-pipes aka Helmholtz tubes - LS1TECH - Camaro and Firebird Forum Discussion