New to DSM's

Hi, my name is William and I just bought a 1993 Plymouth Laser with the 4g37. Well, my problem is that the flex on the exhaust is bad. Where can I find one? Also, I'm gonna buy a turbo manifold off of a 1.6 turbo out of the Colt and Mirage. Now my problem is where can I find pistons and connecting rods for the 4g37 that will handle boost? I'm getting all the piping off of someone I know, and also what about the MAF in the air cleaner? What should I do about that? ALSO, the back brakes act strange. They eat up brake pads like crazy. The guy told me there is some kind of proportioning valve, and if it goes bad, it will eat the brakes up. Thanks.