I found the drivability to be a night and day difference when I put mine in. Especially in stop and go traffic.
This car is too slow to bother measuring! As a track car, my goal is to remove rubber/compliance wherever possible and shave pounds.Do you have any bervore-vs-after 0-60 or 1/4 mile times. There should be measurable improvements made from 30% rotational inertia reduction.