go to the TT flywheel and clutch. A guy local to me (kkrofft (OH)) used an NA flywheel w/ a dXd clutch. He had to get the flywheel drilled to accept the clutch he used because noone makes a strong enough clutch in the NA size. To use the TT flywheel, you will need to grind the inside of the bellhousing a little bit and shim the starter out 2mm.