The cure for drone-- 1/4 resonance pipes aka J-pipes aka Helmholtz tubes - LS1TECH - Camaro and Firebird Forum Discussion
How to build an exhaust resonator tube to eliminate drone - PerformanceTrucks.net Forums
Drone Reduction - Wilhelm Raceworks, LLC
Completely eliminated exhaust drone | Mustang Forums at StangNet
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
How to Fix Exhaust Drone - Cheap AND Easy - YouTube