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Originally Posted by Lil bastard
The typical parasitic draw from a car AC compressor is 10-15 crank HP.
Add to this, an additional 1-2 HP is drawn from crank HP by the alternator (which basically 'free wheels' unless a load is put on it) to power the blower, and you're getting dangerously close to a 10% reduction in usuable output on the 2.5L motor.
If that 2.5L motor is well used, and no longer putting out the 218 ponies it originally came with (or you're not driving at peak HP on the rev curve), the total reduction of usable output could easily approach 15%.
Those are numbers you're likely to feel.
Cheers!
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2.5 engine is factory rated @ 201 HP. I would think Boxster AC compressor load is more like 5HP.