So I installed the AMS catback on the car but when the car is cold what happens is that I hear this creaking noise(like metal on metal or a bad door hinge) from where I think is the cat converter and the midpipe. I placed new gaskets there so is this supposed to be normal for a "break in" or something? This only happens between the 1k to 2k rev range, when you start the car, and only when the actual exhaust pipe is decently cold, after a hard pull the sounds completely go away I assume because they heated up. Maybe I screwed the lugs in too hard as well? There are also no exhaust leaks as I have tested so far. Help please!

 

Anyone have any tips to lead me to the right direction?

 

Probably just a heatshield rattling. Get under there and look at it though, try to move it around a little bit. You'll be able to tell what it is. If done correctly you shouldn't hear anything except for the new exhaust tone.

 

wd-40 on exhaust hangers