I believe the R flywheels weigh around 15lbs, and the rest of the B series ones weigh about 18-19lbs. How much are you getting the R flywheel for? For around $200 you can get an ACT Street Lite, which weighs about 12lbs and is made of chromoly instead of aluminum like the Clutchmasters/Fidanza flywheels. I have the Street Lite with an Action 1MD unsprung 6-puck in my Y8, and I love them. If you want to go lighter than 12lbs, like for road racing and whatnot, ACT also makes a Pro Lite flywheel that weighs 8.8lbs, and is also made of chromoly. The Pro Lites cost a little more than the Street Lites, though.