Almost nobody combines turbos and superchargers. Turbos have lag, and superchargers don't. Either system can be geared to produce the boost pressure you want. Turbos heat up a lot and need hardware for oil cooling. They both add weight to the front end of the car; so it's more efficient to get the desired boost using the minimum hardware where possible.
Nitrous is cheap and easy, but overdo it and you blow your motor. You need your Fuel to Air ratio not to get messed up with the nitrous such that your engine runs too lean, meaning you may need an extra set of injectors.
Meanwhile, your pistons and rings, connecting rods, main bearings, crankshaft and other internals may not have been designed to handle 50%-100% more explosive force, along with associated inertial resistance.
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