"Taking a close look at TRD components, it becomes clear that each one is manufactured using the finest components and materials, like stainless steel. This ensures a level of quality that is expected on a Toyota and Scion vehicle. Odds are, you purchased your Toyota or Scion because you wanted a level of quality that’s second to none. When it comes to modifying your exhaust, you want to maintain that quality, which is why you can count on TRD components. Crafted of stainless steel, TRD systems use factory-type connector flanges and existing factory mounting hangers to ensure a precise fit and long-term durability. In addition, they are designed to mount to existing locations, which eliminates the need to drill additional holes. Also, TRD uses double wall exhaust tips on several applications. Dual wall construction preserves the bright polish stainless finish from discoloring heat."
Little vague, but I would imagine that's what they're implying?