You have the N62 engine and I have the older m62 engine the pipings and angles may be the same . worst case scnenario the muffler shop can weld the pipes to fit the openings to your resonators if the 4.8 exhaust pipes are bigger than your 4.4i.
go for it its a nice project also get the the 4.6/4.8 is valence and side caps, and aluminum brushed running board to complete the look if you don't already have it . pm me if you have any any more questions