I building a car that I expect to run in the 9's on slicks and will weigh around 3,800 lbs.

How much slower will the car be using an Eaton E-Locker vs. a spool in a Dana 60 rearend? How much will the additional weight and rotating mass slow the car down?

Does anyone have experience with an Eaton E-Locker in this level of application durability wise?