Mufler or Muffler: How To spell?
The word Mufler is misspelled against Muffler, meaning "cloth worn round the neck/silencer"
Muffler has double "ff" is mispronounced as "f"Remember double 'FF' in between the strings Mu & ler which should not be misspelled with single 'F'
Wrong Spelling:  Mu-f-ler  Correct Spelling:  Mu-ff-ler 
Check more misspelled words of Muffler to spell it correct.