Quote:
Originally Posted by snopercod
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A Lancair 235? A 235 has a 1/4" ply firewall with a fiberfrax and stainless sheet overlay on the engine side. It may be the quietest in sport aviation.
FWIW, you can probably add sound insulation to a Lancair 235 firewall without too much risk, assuming you don't get it too close to the pass-through fittings; they are local hot spots.
A stainless sheet RV firewall is an entirely different animal.