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Oversized exhaust, headers and/or different mufler.
it will make a puff puff sound while idling.
muffler or exhaust could be damaged....if it has aftermarket exhaust it will sound different since it is not a V8.
Exhaust leak at Exhaust manifold to head gasket or oring at exhaust manifold pipe.
Many things contribute to the sound but the most important are: -Large displacement -High lift cam -High compression ratio -Bigger exhaust diameter
an idling diesel engine or snoring :]
Listen to it. if it is making loud noise you will hear it... assuming by noise you mean sound wave vibrations within the range of human detection...
exhaust tip or glasspack it
This may be the indication of a spark plug miss.
Generally, the engine will sound louder. If you take a rolled up rag (so you don't burn your hand) and hold it tightly over the exhaust pipe while the engine is idling, you will hear a sound like compressed air leak. How long you can avoid repairing it depends on how much you value your life. Leaking exhaust can enter the cabin and carbon monoxide in the exhaust is deadly. Leaking exhaust does no other specific damage to the car unless the hot exhaust blasts against something flammable or the exhaust system falls off.
It sounds very much lke you have a leaking vacuum hose. Either it has deteriorated and needs replacing or it has come off its fitting. Carefully check the engine compartment in an effort to locate the source of the hissing sound. When you do repair or replace the hose you will probably cure the source of your idling (and hihssing) problem(s).
By adding a dual exhaust and/or exhaust headers either short or long tubes for sound and performance