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I have gone through that conundrum when working on my old 911s. Do I keep the old rust prone heater boxes or upgrade to stainless or have the originals coated (for example)?
Very personal decision but, if you are enjoying of planning to enjoy the Samurai (cool toy!) put the dynamat, make it comfortable to YOU. You are the one using it, when its time to sell, describe it as an upgrade (which it is).
In your particular case, you might be able to use an underlayment which is not glued to the chassis. One of my prior cars (an Infinity Q45) had sections of a think rubbery vinyl pad under the carpet. It was not part of the carpet nor was it glued.
hope that helps!
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International GT Champion; Porsche GT3 Cup Trophy Champion; Klub Sport Challenge Champion; Rolex Vintage Endurance Series Champion; PCA Club Racing Champion; National Vintage Racing Champion
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