yes you need it!
I am ordering all my part for a truck biuld.
truck is a 2006 cummins qcsb, thuren 2 inch lift, 33.5" tires
ATP EFI v2 tuned by Rob, dual cp3s, flux 4s(200 hp injectors), twins 63/80, and other supporting mods.
On my trans is it worth the extra $$$$ 900-1000 for the billet intermediate shaft.
The truck is my Daily Driver. will be ran a few times at the track to see what it will do, tows some like 10,000lbs max (will be ran on lower setting). and 4wd launches at low boost, 10-15lbs