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