Building the motor
More fuel Little big turbo
New down pipe and waste gate setup
Rebuild t-case
Weld center diff
Maybe a bigger intercooler
Different wide band
Stall converter
Get rid of the AGX's and Tiens Blah!
Re Upholster the head liner
Tires
EF3 isn't little. Sounds like you will be the one to beat at stock appearing class.