If a buzzing noise is coming from the exhaust at different engine speeds and conditions, this is commonly caused by the heat shields on catalytic converters coming loose at points. The buzzing is the metal on metal contact. Installing a large worm clamp around the catalytic converter and heat shield assembly will prevent the noise and secure the shields.
Buzzing Noise from Exhaust at Different Engine Speeds on Ford Mustang GT
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ticking sound coming from the top of the engine on the right side, during idle, and gets louder...
tapping noise in from engine
4.0L V6 engines may develop a buzzing type noise from the upper engine area at about 1900 RPM...