I'm not sure yet how much difference the flywheel has made, I haven't really gotten of the car, as the new engine only has 74 miles on it right now. The MM flywheel weighs 9 pounds 10 ounces, and the whole assembly; flywheel, clutch and pressure plate; weighs 24 pounds 4 ounces, but my dad has a lightened single mass flywheel that weighs 17 pounds and it made a huge difference.