It will work with the stock emaxx chassis, you just have to grind down the bump stops that get in its way, your sloppyness will be a thing in the past with this servo saver!
The problem with nitro's these days are that they arent brushless... LOL
Losi 8ight e
MMM / Neu 1512 2.5d/f
Thunderpower 5s 5000
There are complete alum steering assembly's without intigrated servo saver, but I doubt they are good quality. You still need to modify your chassis, whatever you chooise.
If its at all possible - get the supermaxx - it works awesome - you wont be dissapointed in the least. And it takes a heck of a beating and still works flawlessly.. Just my .02