If you boil plastic doesn't it make the plastic less rigid? which would equate to warped or bent plastic? I think I would rather have a broken arm and replace it then to have a warped a-arm which may be very difficult to tell. I don't have any knowledge in this area and could be wrong....maybe the boiling just makes them a little more flexible enough where they won't snap and don't effect the cars performance. I read in the forums tekno said they tested a bunch of different plastics and went on this because they wanted it rigid....guess it doesn't hurt to try.