DEI 500410 Interior Insulation & Damping Kits Side Panel kitDesign Engineering is leading the way with the most advanced Thermal Acoustic kits for your first Generation Camaro and Firebird F body cars (1967 1969). Using a combination of our new D Mat ultra lightweight insulation and sound absorbent material, our proven Under Carpet Lite, and 2mm Damping Material, we offer an effective and affordable solution to combat unwanted heat and noise.