I actually have a '92 300E. The weight is a bit heavy than a 190E. Therefore I am thinking about the 600SL upgrade instead of a 400E brake upgrade that I original planned for. I know lots of people in the forum suggest the 400E brake upgrade because of the simplicity and the uncertainty about the hub in swapping to 600SL brake. That's why I try to find out exactly what has to be done on a 600SL brake upgrade to the 300E. Any other input?