Here's something I found:
"Thanks to Carl at BergWerks, the 2.82 diff swap went well. I haven't picked up the car yet (this week) so I can only go by the numbers he gave me.

Pre-swap 0-60 times was 7.1 seconds. Post times were 6.5 seconds. Turns out that I had a broken kickdown switch. Not sure how (or if) the switch fix will change the times."

400E going from 2.24 to 2.82 gears.
400E differential