Walker air gap pipe, is double walled pipe with an "air gap" between layers of pipe to promote insulation and allow faster converter light-off, for reduced emissions. Walker incorporates air gap pipe into designs where the OE uses that technology (or a full 360° heat shield), and also where the front pipe is integral part of the converter assembly. Using air gap pipe also assures that there are no jagged edges and no possibility of the heat shield weld coming loose to cause noise.

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Walker part numbers constructed using air gap pipe technology are identified in the catalog by foot note .