Can you upgrade a normally-aspirated engine to a supercharged one?

While it theoretically can be done, the cost would be greatly prohibitive. You would need to switch the driver's side valve cover, the SC unit itself, and various other parts, as well as the ECU.

It would be wiser to trade in, and purchase an SC model, or a NextGen X, which comes standard w 265 Horsepower. The 2000-2004 crank out 170 to 180, and the SC only brings you to 210.