Don't forget though if they find out that you have a pulley, then your supercharger takes a dump, bye bye warranty claim. Bottom line is if they find out that a modified or aftermarket part caused the failure then you don't have a claim.

If you were to leave your car stock, which is hard to do, then I would say it's a good investment. If you mod it, you might be out the cost of the warranty plus the full cost to replace the part(s).