Help! Weird exhaust clicking sound when engine braking/deceleration

[DustGT]

See towards end of videos for sound. Car sounds great under load but when engine breaking/declaration I'm getting that weird flutter/click sound. Ideas?!?! Need some help. Car is 100% stock besides the active exhaust H-pipe installed

*SHOP CHECKED FOR EXHAUST LEAKS AND MALFUNCTION IN EXHAUST FLAPS - those are both cleared*





Taking it back to the exhaust shop tomorrow afternoon to get the stock resonator back on if the forum doesn't have solutions :/

Wtf over... Any ideas highly appreciated!

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[DustGT]

Bump for help

 

[Bluelightning]

Sounds pretty normal for the stock mufflers and an h-pipe.

 

[DustGT]

What is all the consistent metallic fast clicking towards the end of the video? Everything I see on active valve exhaust videos on YouTube don't do that

 

[Andy13186]

May just be the coyote growl

both my 11 and 18 mustangs have had that on decel or dropping revs, usually in neutral though

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