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One bad tank of fuel and your fuel filter can become clogged and give you sluggish performance.
Fuel pumps have been known to go out at 40k or even earlier.
Your MAF or 02 sensors might be crapping out on you and not yet throwing a CE
A leak in your exhaust system usually doesn't affect performance unless its quite large and doesn't give the motor enough back-pressure.
Most aftermarket mods always make for a loud Boxster. Lord knows I've got a loud car.
The possibilities are numerous as to why your car is sluggish. Diagnosing it over the internet is probably futile. You're doing the right thing though getting it to a mechanic who can hook it up to a PST2 tool and diagnose the problem properly.
Do come back to this thread to report what he says though. I'm interested to learn what the true culprit might be.
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