^^^ +1... get a 3.73 LSD or something... that will be fun...
Also throw up some pictures mate... sounds like a nice ride!!
In terms of engine work... you can do internals and a cold air intake...
Some YT RR will go a long way in making things more interesting plus the only way they can tell you have done them is if they open the rocker covers...
Either way... throw up some pix and good luck with it!