I just did OS Giken super lock with the 4.08 final drive. The final drive is great but not a replacement for a turbo set up. If you are looking for tenths of a second gain get the final drive. If you are looking for 1 or 2 seconds go turbo. But dont bother with the final drive if you are not upgrading the diff to the OS Giken. The OS Giken is sick. I have only had it on the car for 3 days and have yet to get the back end to step out. I have taken my car to places where I typically break traction...I have been stunned at the massive amount of grip the car has now.
Sorry no info on drag use but hope this helps.
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