The owner's manual for a 1985 280SL lists the vehicle weight as 1540kg/3395lb, but shows gross vehicle weight as 1920kg/4230lb. I guess the gross figure includes a bunch of options and full liquid levels. Can anyone advise me as to the relative merits of replacement catalytic converters? I have a quote of around $65.00 for a universal unit and $450.00 for one designed for a 280SL. Both are cut and weld units. A European Mercedes unit (which they won't supply to North America) is $2,800.00 so I won't be going there! Unfortunately a lot of parts suppliers are familiar with the Pagoda 280's and don't bother to differentiate between them and the Euro 107's. I don't know just how important things like back pressure are but the car currently runs like a dream and I don't want to screw that up. Any advice or information would be welcomed.