This is a stock replacement flywheel that is made of aluminum. It has a replaceable friction surface for when the clutch needs to be replaced in the future. The factory flywheel weighs 19.5# and our ZZP flywheel only weighs 8.5#. That is a lot of rotational weight to lose, this will reduce parasitic loss and improve shift feel due to the RPMs being able to drop faster so the synchros will mesh better. Any LSJ/LNF based pressure plate and disc assembly will bolt up to this flywheel. Only works on the 8 bolt 2.0 liter crank and F35 5 speed transmission.