I am running the labonte motorsports kit I used to hit 1700 degress by 80MPH now it wont go over 1600 degrees in the 1/4 mile.
I think I need a bigger turbo now;)
I installed a 6" Tuff country (which I would imagine is the same steps) by Myself it took about 3 days.
A torsion bar unloader tool which isn't totally neccesary is the only thing that comes to mind
If you have a good set of tools and a sawzall it isn't real difficult to do just time consuming