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Dynamat, or any of the knock-offs (JC Whiney actually has a good one), does a nice job. While I had my trans out last winter, I put a layer between the heat shielding and the floor of the trunk. If the engine comes out, I'm doing the inside of the engine compartment. Seems that if you get the dampener between the sound source and the car body, it works better then if it's applied on the inside of the car.
I've got headers/no cats/Borla and the carpet and factory sound deadener is gone. It's loud but liveable. And light. And fast.
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