Exhaust Sound

are you sure your car is running right? a muffler is meant to muffle the engine, if the engine is sputtering then you may get that interment sound.
have you checked for a exhaust leak?
 
Without hearing it, have you checked to see if your cats are in good condition?

Again, like theMerchant asked... is the car running ok? Loss of power, excessive heat near the floor, engine shake?
 
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