If you wanted extreme mods you shouldn't have bought a stock one
like what I did with my EMAXX, everything was aftermarket
Anyway, if you are looking to just power up your stock E-Revo minimal mods on the chassis. Check the Revo forum there are several guys that had their setup. You can look at mine too...
but its only a simply one.
Not mine
http://www.rc-monster.com/forum/showthread.php?t=13645
http://www.rc-monster.com/forum/showthread.php?t=13245
There is another one I cant find it maybe you can try use the search
Motor ESC and batts are the best bets....they have hundreds of thread here at RCM. Try brushless forum for that one....