Yes,they are an easy D.I.Y.;
http://www.bombaydigital.com/boxster/projects/brakes/
If the sensors haven't gone off yet then there is no need to replace them.
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-99' Zenith Blue 5-spd...didn't agree with a center divider on the freeway
-01' S Orient Red Metallic 6-spd...money pit...sold to buy a house 
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