You'll need to use the wider front end shocks, inorder to have proper suspension travel. Also required are longer radius rods and tie rods, and a sway bar. You should be able to save some $$, by getting most of these parts used.
I just done the same thing to my MMax, I hated the narrow stance when trail riding, I got a complete front end off an XTC and the new updated Viper shocks, now i get a wider stance and 3" more travel.