Originally Posted by wcgman

Ok - so you know, you do NOT have a ford racing CAI. You have a Ford Racing Intake Manifold (http://www.americanmuscle.com/ford-r...-manifold.html) That might mean that the car also has other work like cams done on it. Looking at the second picture and the rake of the car, this looks like it's had suspension work done because it's clearly been lowered. It is very plain to me that this is not a stock GT. There's been other cosmetic work done on the car too. With all of that, you actually might have gotten a damned good deal.

The shaking during braking is very likely warped rotors. Just cut to the chase and replace them. While the calipers are off, follow Derf's advice and install the hardware kit which will almost certainly fix the creaking. You should also lube any bushings you see. Everything that CMcNam said is also on the money. I would not sell this car. Chase the little gremlins for a while and fix them. Once you're done, you will have a car that you are happy about and will treat you very well for many years and miles to come.

One other thing to potentially try is to hit up the major vendors like American Muscle, etc... who sponsor this site. Ask them if your VIN is in their database for a tuner and if they can tell you what parts were sold to the previous owner. You might be able to get that info as a baseline to know where to start in fixing some of the issues you are having. Best of luck.