check this out:
Vehicle noise: On cars with a manual transmission, the power-steering-pump belt may squeal during parking maneuvers. Replacing the original aluminum pulley with a steel pulley eliminates the noise. (1997-98)
http://consumerguideauto.howstuffworks.com/1997-to-2004-porsche-boxster-2.htm
Brad Roberts told me some of the engines came with steel pulleys. OK so it might not wind up as fast, I'll take the reduction in squeal. I wonder if the dismantle locations have the steel variety?