extend toward exhaust manifold 26 the material choices for the thermally insulating and vibration and noise dampening insulation layer 74 are fairly broad such choices may include non metallic fibers such as aramid fibers or ceramic fiber paper depending on anticipated temperature ranges even non fiber compositions may be employed such as densified vermiculite powders for example one method of manufacturing of the heat shield 30 can be described as follows the inner metal layer 70 and the outer metal layer 72 with the insulation layer 74 interposed between are positioned within a progressive die not shown the layers 70 72 74 are stamped and formed in the progressive die to the shapes depicted including the dimples 84 94 104 the layers 70 72 74 may be trimmed either before after or during stamping the progressive die includes male and female forming tools that are pressed together with layers 70 72 74 positioned therebetween the male and female forming tools have complementary surfaces cut therein to form dimples 84 94 104 as the male and female forming tools are pressed together layers 70 72 74 are formed into the general shape depicted in fig2 and 3 without significant dimple formation in the last few millimeters of die travel the dimples 84 94 104 are formed within the layers 70 72 74 the outer edges of layers 70 72 are then attached such as by crimping and may be crimped before removal from the progressive die as best seen in fig3 and 5 when heat shield 30 is formed with.