Anyone know or able to measure the weight of a 6.9 piston? Faced with a rebuild, would one be well advised to souce custom hi compression pistons made from lighter high strength modern materials? Would such a mod allow a M100 to rev higher and more quickly?? I remember reading a while ago about max piston speed that MB engineers were faced with during 6.9 development. Obviously they were concerned about durability and the pistons not coming apart but with that comes increased weight. Was the...