Sounds like a better option might be to trade the Boxster toward a used 996 Turbo and if you're still worried about power they can be modded to over 700HP.
The all-wheel drive on the Turbo will allow for better launches and less wheel spin. In addition to the Boxster I have a 996 C4S which is very quick indeed but no plans for forced induction on either one.
The 3.4 and supercharger route sounds like a ticking time bomb especially if you're pushing it hard. To get it right lots of internal and ECU mods for the engine have to be made to compensate for the forced induction. Definitely not a bolt-on DIY job.
Go for the Turbo if you really need the excess speed. ;-)
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