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I choose the Solo Performance axle back system with J-pipes that automatically tune out droning. Like Blueforce said, its a personal prefference, ask around your area to see what ohers have installed and see what they sound like, unfortunately you'll have to wait until the weather turns.
AFM actually stands for Active Fuel Management, the engine control module shuts off 4 of the 8 cylinders to converse fuel while cruising at a constant speed. When this happens it causes a droning noise that is usually not noticed until the factory exhaust is removed.
Range Technology makes a plug and play device that prevents AFM from activating, I just bought one but because IT'S STILL SNOWING, I haven't tried it out.
Good Luck!!
Paul
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