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Well, to get any real noticable performance gains you need to be able to increase HP and/or Torque by about 10%. If you remove them the car should see a moderate HP increase maybe 1-2%.
I would guess maybe 3-5 hp.
The car will be:
lighter, slightly louder and have better gas mileage.
Since I've never seen a no cat boxster setup it may also cause some of the electronics to be readjusted. The computer reading the fuel system and exhaust may be confused if the temperature changes in the piping system. The back flow of the exhaust system will change. This might actually have a negative effect on HP gain.
That's what I'd say if we were drinking beers in the bar.
Anyone with 1st hand knowledge?
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