1. Softer springs, harder oil for bumpy tracks
2. +1 rear diff cams
3. higher rear upper links
4. one screw on the motor mount
5. 1.6mm carbon top decks
6. no screws attached to shock tower, only on chassis
7. bump steer more washers
8. Less toe gain

The changes improved overall pace, and has lesser fade in 5 minutes.

Source: