I have a 92 saturn sc and I have been hearing this dull knocking noise as I make a turn. I hear this same noise as a slowly brake the car or accelerate from a full stop. I have been told at first that it could be a ball joint, then told that the problem is the rack and pinion, but I do not have any trouble steering. Any idea what the problem is I do not want to get ripped off

Greetings; Car is a 1994 Toyota, Toyota Corolla, a/c 1.6l engine, automatic. Recently I have noticed that the car seems to be straining to maintain highway speed and the mpg appears to be dropping. On startup the car sounds loud, almost like there is a exhaust system crack somewhere, but I can't seem to isolate it. This also gives a high noise volume when at highway speeds, but not the roar you would associate with broken system. My problem is that I have nothing to compare the car to! I don't know anyone with this type of car. They all have SUV's. ( for now anyway!) Question is will a obstucted \ broken exhaust system affect the performance of this type of car? I know on some other cars I had owned that a certain blowback pressure was desireable for proper engine performance.