I just bought an 1992 SC400Ok when turning the wheel at a stop noise comes, only when the car is cold though, when it warms up, no noise. Should I be worried? What precautions should I take? Also, what things would you change out (i.e. tune up) when buying a used sc400. should i just flush all my fluids? (trans, diff, PS, motor oil of course). sorry for all the questions but I have one last one. I'm looking for a little more performance, and I plan on taking out the 3rd cat. What else in the exhaust system can i do, besides taking out the other 2 cats and replacing the mufflers? what bout those to canister type things before each muffler?