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Sanderson GPM350 GlassPak Replacement Inserts

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Sanderson GPM350 Glass Pack Replacement Inserts for outside chassis turnouts. (sold in pairs)

  • $68.00
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Sanderson GPM350 are replacement muffler inserts for Sanderson's outside chassis turnouts that come with their Roadster Header sets.

Fits all lengths of Sanderson turnouts.

  • Sold as a set (pair)
  • Easy slip-in installation

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The GMP350 Replacement Muffler Insert may be installed in either direction.


Looking inside the muffler insert you will see radiused channels (or louvers). The installed direction of the louvers effect the sound level.

  • When the openings face downstream away from the engine, the sound level is slightly louder
  • When the openings face upstream toward the engine, more exhaust gases divert through into the fiberglass packing, reducing the sound level