I bought a Fidanza flywheel and unorthodox underdrive pulley, and I called a shop to get an estimate on installing this stuff. They told me 12, yes 12 hours to install the flywheel. They said the entire engine/trans would have to be dropped to get to the flywheel. But then the underdrive pulley only takes an hour or two to install. Is this correct? Has anyone replaced their flywheel?