I had a aluminum flywheel for 2 years. It was great, a small blip was all I needed to heel and toe (rpm match) on downshifts, throttle response was awesome, and the flywheel was tough as nails. drag launches sucked. Keep in mind the Aluminum flywheels are geared more towards the road race crowd where reduced flywheel inertia really helps. They also help your trans some, by not hitting it with as much force. as far as a street car, I cant see where they would really help. I would prolly have stuck with my iron flywheel if I woulda known it doesnt make much difference on the street.