integrated heat shields to manage high engine bay temperatures and reduce heat soak. Options range from stainless steel, 3-inch catted or catless designs to high-performance coated alternatives, often featuring flex joints to handle vibration and improve durability. 

This video explains the necessity of heat shields on downpipes:

Heat-shielded options are often preferred to prevent excessive heat transfer to the engine bay, which can be a concern with non-shielded, thin-walled stainless steel pipes.