Folks have supercharged the 2.7 Boxster - with mixed, but generally good results.
The S in not worth supercharging.
The 2.5 is best replaced with a non e-gas 993 or 996 engine.
Renntech, PPBB, Boxster Racing Board have all discussed real world supercharging experience in the past. Adding HP to a Boxster isn't cheap.
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