no its not hitting anything, its coming from the inside of the exhaust and MAYBE because of this part of the exhaust tip
exhaust tip.jpg
Its not flat to the pipe before the tip and its sticking out so maybe im guessing its coming from there because when i tried to block that part with something so the airflow o sound will go straight the weird sound is gone
Untitled.png
lol sorry for the bad drawing so its like that from the picture above