[gherbert]

Well guessing it was not a stainless steel exhaust.
Is it also having impact damage?

 

[gherbert]

Nope. Daily driver to work and back.

Also, not stainless, but 2 weeks? That's ridiculous.

Where are you getting the exhaust from?
Ether using bad steel or made wrong

 

[gherbert]

Well either your mechanic needs to replace it again
Or you need to go somewhere else and have it fixed hopefully correctly