Heat Shield/ Muffler Blanket. NSN 2990-01-106-8215. Made by Advanced Thermal Products for Bradley Fighting Vehicle. P/N 12293160. We have used these on our race car to keep EGT’s high, isolated and away from electronics and driver. Military spec means top quality. Cost over $150. each originally Official description: Cover elbowed shaped configuration; outer material fiberglass, silicone rubber aluminized; inner material thermal insulation; interior fabric material fiberglass, aluminized on one side; inside dia 4.000 ins one end, retangular on opposite end; 26.100 in. O/A h; 19.260 O/A width L2A10 END 13542