I wrote a whole article on this as the technical editor for Ultimate Hummers Magazine. It will be out soon.
The short answer for tonight:
Magnuson warranties their SC for three years. That is for the SC and its components--not for the engine or powertrain. You can buy an aftermarket warranty from Magnuson that will cover up to 3K engine and 2K drivetrain. IF ANY OTHER MODS are done to the truck, the aftermarket warranty is void. That means bigger tires, headers, intake, you name it.
The centrifugal SC's work cooler than a roots style like a Magnuson. They start making boost at 2500-3000 RPM as said before.
A Mag will make full boost by 2500-3000 RPM--that is why you get the back into the seat feeling from the roots charger.
For a high end race car a centrifugal is used often because of the adjustablity of high boost in the upper band and cooler discharge temp per pound of boost. Their blocks are strengthened for this higher boost. A lot of muscle cars use centrifugals because they already have low end power.
For the average H2 driver, the roots style gives you punch off the line and moocho power when passing. All SC's come with risk because you are adding HP to a stock block. That is why GM will not warranty them. Maybe your dealer will by adding 3K to the price and hoping all is well. If you move out of state, forget the promise from the installing dealer.
I will be happy to install a Magnuson on your H2 and give you an engine and powertrain warranty for 9K. That is with an intercooler, ECU programing, fuel pump, etc.--it is all part of the kit and the install. You will have to abide by various paramters based on the SC design but I am confident, you will have no issues. BTW, my normal install price, including the complete unit is around $6000-$6150.
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