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Imo supercharger is likely actually safe on the motor for a DD. Forced induction only adds torque. NA power adds power through torque and rpm.
You can gain hp by increasing torque and/or increasing rpm, gaining hp through torque is always easier for the engine then increasing rpm..
The problem is forced induction has a lot of heat issues. High egt's and intake temps are difficult to manage especially with an aftermarket application, and sustained power through forced induction becomes more dangerous.
So it depends what your intent is. If a daily driver and you don't intend on long periods of repeated WOT, a supercharger is likely easier on the motor. Take it on a race track though, or even texas mile events, and it's more than likely you'll be able to do a lot more of those on an NA build.
That's not discussing the transmission and drivetrain though, torque is their enemy where as hp through rpm is no problem at all. Not much of an issue with the 8l90 though until you are making big power.
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