Patent ID: 7273129

Claim:
A heat shielded muffler comprising: a first external shell stamp formed from a metallic material and having a peripheral flange and a chamber projecting from the peripheral flange, the chamber defining a concave inner surface; a second external shell stamped form from a metallic material and having a peripheral flange secured to the peripheral flange of the first external shell, the external shells being formed to define at least one inlet to the muffler and at least one outlet from the muffler; a heat shield comprised of a fibrous insulating material compressed to a density in a ranged of 5-11 pounds per cubic foot and configured to conform to the concave inner surface of the first external shell, portions of the second external shell spaced from the peripheral flange thereof having no heat shield adjacent thereto; and a sound insulation material disposed in the muffler adjacent the heat shield, the sound insulation material being formed to be less dense than the heat shield.