Both chargers are belt driven--so when the second kicks in fully, your boost would be way high--too much for the 6.0L. Fuel management would be a bitch as would programming. I doubt the PCM could adjust for this high boost condition.
Cetrifugals are fairly new and are used on vehicles that already have good low end torque--like a 350Z for example. The engine gets the machine going before the cetrifugal become efficient. They run like the rice rocket that they are.
When you use a centifugal on an H2, it runs great except you do not get the punch off the line because it is a big heavy box without enough low end torque. There is no noticable change in power right off the line. The centifugal in the mid band range runs cooler and gives great power in towing situations.
The roots gets hot after a long WOT, like the last 1/8 mile of a 1/4 mile run. This heat retards the timing, making the engine less effficent--the SC heated air reduces the amount of air---therfore fuel into the engine. This can be solved by a larger intercooler---I am having one built right now. However, for street use, a larger intercooler is a waste of money. The roots run great under any street condition.
My only advise was that if you tow a lot, the centifugal is cheaper and answers the mail power where you nedd it---in the mid band.
Feel free to ask more...........
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