Chattering noise coming from passenger side downpipe/turbo

[SenditRaptor]

Any ideas on this weird sound? It sounds like a chatter noise coming from passenger side downpipe/turbo. No noise on startup or when idling. Happens on nuetral/park and driving at around 1500 rpm, and upon deceleration. No difference in 2H or 4A while driving. No warning dash lights. Have had a full aftermarket exhaust on for about a month.

 

[91Eunos]

Waste gate or heat shield is my guess