94 GT Squeeks?

[Rice Hunter]

Ok, I had a 94 GT and had sold it to a friend. I had only put Borla exhaust on it, and it was kept in great condition (even though it had 94K miles on it). At 96K miles he says that there is a squeeking that sounds like it is coming from under the car in the rear. It squeeks only when the car is cold and not when it has been running for a little bit. It is pretty loud and sounds like metal on metall. It happens when the car turns in the first few minutes of driving, then goes away. I figure it could be the Borla cat back swaying loose. I had trouble with it before, the pipes were knocked off (people suck sometimes) and were actually rubbing against the wheels. When I had it fixed, it took only fifteen minutes and the great guys at the shop didn't charge me. Thanks guys. Anyway, you think this squeeking is loose cat back or something else, say chasis? Thanks for your help!