how much of the weight savings is taken off of the outer edge of the flywheel where it would make the biggest diffrence? a flywheel can weigh diffrent weights but if 50 percent of that weight is on the outer edge of the stock on while 70 percent is on the outer edge of the after market one, thats not too much of a diffrence. also, how much does the stock clutch and pressure plate weigh for a W58 trans? i didnt weigh the stock one yet or the xtd one i put in but the xtd pressure plate felt lighter. it was shipped ups at 18lbs. i will weigh the stock one when i get a chance.