Half way down the exhaust system of my 2001 GS430 I have a completely corroded pipe. Looking at it on the ramp it the mid section could theoretically be replaced, but the bolts onto the first set of cats are very very badly corroded and it's doubtful if they could be removed in such a manner as to allow attachment of the new pipes. Similar problems at he other end. It seems to me that from a labour point of view it would be cheaper to replace the whole pipe and all three cats. Question is, are how much would parts cost. Are there acceptable pattern parts? Would a system be available at a scrappers? Is the system particular to the 430 or is it used in other vehicles. All information greatly received. It's a beautiful car and I really don't want to scrap it, but at the moment it's looking like the costs will be way more than the value of the car.