It breaks, that's what haha
it's not a major difference in weight, but for those that are hardcore and don't play on running super high numbers, it should be something they might want to look into.
The parts needed would be just like an auto to manual swap, minus the pedals. That means tranny, flywheel, shift fork, clutch, pressure plate, slave cylinder, tranny mount, and front half of the driveshaft.
it would be a good idea to go with a lighter flywheel and possibly a cf driveshaft for W58s. You would DEFINITELY need a stronger pressure plate and clutch, as the stock won't hold anything , even stock boost...