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
Yes, an exhaust tip can change the sound of the exhaust to some extent. It can alter the tone or volume of the exhaust noise but will not have a dramatic impact on the overall sound of the vehicle. The design of the exhaust system and muffler play a more significant role in determining the exhaust sound.
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.
By adding a dual exhaust and/or exhaust headers either short or long tubes for sound and performance