Cold Start Rattle/Crackle

[ToadSmasher2K1]

I’m getting a loud crackle from the passenger side engine area during cold starts. Also during moderate acceleration I’m hearing a fluttering type sound.

Any ideas?

Exhaust leak? Exhaust gasket?

 

[SK Raptor R]

I had a similar sound but from the drivers side. Took it into the dealer and found out it was leaking around the exhaust manifold where it hooks up to exhaust pipe. Apparently was loose. Needed to be properly tightened. It was this way right from new. Somehow got missed during PDI inspection.