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I have the heatblok carbon fiber stuff that some of the other posters reference. Got it from Tim Cox, and it fit the car *very* well.
It's promoted primarily as a heat insulation rather than a noise barrier; after installation I could certainly notice a difference in cabin heat but any change in noise was pretty minor. To be fair, though, this 122 is much noisier than most - very loud exhaust, plus the noise of the engine, plus the noise of the supercharger.
Worked every bit as well as advertised.
Best,
Cameron
Rose City
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