Pop noise when idling or right after shut down after accident

[gtptyler]

I unfortunately was hit in my denali last Monday. I was backed into while driving through a residential area and the damage was kept to my wheel and wheel arch on the passenger side (no apparent damage to drive line). I have now noticed a loud pop noise after shut down and even when idling after driving some. it seems to come from the underside rear and sort of sound like the exhaust when cooling down but waaaay louder.

Anyone have any ideas so I can somewhat point the body shop in the right direction when they are fixing it up? Thanks

 

[ccapehartusarmyINF.(ret)]

sounds like its backfiring wich usually means its a timing issue
how hard did the guy hit you?
look over yer passenger side exhuast manifolds make sure you dont have and broken bolts and what not

 

[Mr. 960]

Could it be an evap purge valve? It is around that area. Also look over your gas tank real well for signs of damage.

 

[gtptyler]

sounds like its backfiring wich usually means its a timing issue
how hard did the guy hit you?
look over yer passenger side exhuast manifolds make sure you dont have and broken bolts and what not

I should have included that sorry. Wasnt overly hard hit and it was the back wheel and fender that took the hit and I would say the wheel took the brunt

back of arch

Small dent above arch

Damaged wheel. Cant see but its all gouged up and cap was shattered off