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Originally Posted by j.fro
While I had my transmission out this winter, I decided to do a couple of things to get rid of some of the exhaust drone in the cabin. I removed the heat shield from beneath the rear trunk and lined the sheet metal with black Hushmat. It molded well around all the curves, etc. and the heat shield went right back on. I also removed all of the stock sound deadening from around the engine compartment and replaced with more of the Hushmat. Finally, I put a layer of Hushmat in the engine cover between its heat shield and the inside plastic.
Bingo! Yeah, since it's pretty much an open exhaust, it's still loud, but the 2800 RPM drone is gone. My wife and I can actually have a conversation on the highway. And the hushmat came in a few pounds lighter than the stock stuff I pulled out.
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What kind of exhaust do you have ?