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NOS on the Boxster would be a lot more than $500. For around $500, most of the kits are plate or fogger systems to be used with wet intake manifolds (ie, carburetors). This is what you see on Chevys and Fords. It's a plate sandwiched between the carb and the intake. It's plumbed with the nitrous and fuel, which usually has it's own dedicated fuel pump. During combustion, things get hot enough to release the extra O2 molecules from the nitrous. The extra fuel helps to slow the burn and cool things down. Without the extra fuel, things get lean and temperatures skyrocket. The problem with the Boxster (and most modern cars) is that we've got fuel injection with a dry manifold. You can't just put a plate in after the throttle body. To add nitrous, you would have to put nitrous injectors and solenoids in each intake runner as close to the fuel injectors as possible. Then, you would need to either enlarge each of the injectors to flow enough fuel to get the correct ratio with the nitrous (likely resulting in a very rich condition when the nitrous is not flowing), or you would need to add another set of dedicated fuel injectors to work with the nitrous, which would make for some very crowded intake runners. Along with the injectors, you would probably need to plumb a dedicated fuel line and add a fuel pump. The stock system would not be able to handle the added load. To top things off, you would need to reprogram the ECU to, at the very least, retard timing during the nitrous application. Whew!!
And with all of that said and done, the only place you'd be allowed to do any competition would be the drag strip. PCA and SCCA prohibit use of nitrous in all classes, as do most other AX/track organizations. The folks at he drag strip would be happy to take your cash, being that lots of those cars are in the 1000+ HP range. I used to have a 71 Camaro (no nitrous, but I've worked with others who had it). It was like getting shot out of a cannon.
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