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Jaay knows what he's talking about. I have a chinese twin-chamber muffler on my car ($300) and bigger headers ($150???) with factory cats and it sounds glorious, but there is cabin resonance (drone) between 2200k and 3000k rpms.
Not a problem on the freeway. I drive a little faster and stay out of this range.
However, when I am forced to drive the car with the top up in traffic (when it's raining for instance) the cabin resonance is deafening.
More expensive twin-chamber systems are also drone-prone.
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