Vortech and others make centrifugal chargers for the H2---specifically the 6.0L Gen III engine.
The difference is in design and use is considerable. The roots type used in the MagnaCharger are considered the best of its kind--have one on my H2. They are designed for instant throttle response and therefore give you an instant punch you can feel when you stomp on it. They also work well at highway or better speeds. Their power curve is flattens out at prolonged high rpm due to the inability of the intercooler to provide long term cooling. On a 1/4 mile run, they peter out in the last 1/8th mile. For long trips when towing, they get hot.
The centrifugal charger provides more air the faster your engine turns. They have a linear power curve at the high end and do not create as much heat. They do not give you the instant punch because they need some RPM to really start working. They are not efficient in the first 2000-2500 RPM (an estimate--no dyno here right now). However, they work like hell after that.
They are also simple in design, run cooler and last longer.
If I was towing, I would have the centrifugal---you will be passing other in the 50-70 MPH range where there is lots of power. If you want the punch on the street to play with the rice rockets, then a roots type would be your choice.
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