BLUE BIRD MUFFLER  CAT MUFFLER
   DONALDSON MUFFLER  FORD MUFFLER
   FREIGHTLINER MUFFLER  GMC MUFFLER
   INTERNATIONAL MUFFLER  ISUZU MUFFLER
   KENWORTH MUFFLER  MISCELLANEOUS MUFFLER
   PETERBILT MUFFLER  SUTPHEN MUFFLER
   UNIVERSAL MUFFLER  UNKNOWN MUFFLER
   WORKHORSE MUFFLER