All stock heat shields are now classified under the new Thermal category in the VAB/SPH editor, and spread across various Landing nodes in the tech tree.

Therefore, the SDHI to be reclassified accordingly.

The stock 2.5m Heat Shield is listed under the Tier 5 Landing node, but the SDHI equivalent is instead listed under the Tier 6 Advanced Landing node - this keeps the latter in line with other SDHI SMS parts, but can also be justified in that the SDHI uses more "advanced" manufacturing techniques.