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sound like either the EVAP (charcoal) canister purge valve or the EVAP canister itself coming from your passenger side front fender.
After driving for awhile my Boxster would make this same sound whenever I shut the it off.
I tried changing the valve but the noise still persisted so I end up changing the canister as well and once I changed that, the 'whine' went away.
Not sure this applies to the MY97 but I'd pull the canister and get the numbers off of it first. I say this because I didn't and just ordered a valve and when that did not fix my problem, I ordered a canister. Apparently the MY99 (which i have) can possibly have one of two different canisters. As luck would have it I ordered the wrong one which did not have the correct attachment fitments or even a hole to insert the purge valve.
Luckily I was able to return it to Sunset and get the correct one, which, as my luck would also have it, had the valve already in it so I ended up wasting $100 on a valve I did not need.
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- ian
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