Hi,
If you have a 2001 then you have the e-gas and not the wire throttle.
There are several revisions of the MAF for e-gas, and if you had a 2000 there would be a chance that you had the earlier one. For 2001, you have the most recent revision. This article from Pelican Parts 101 Projects for your Boxster has a breakdown and also a link to order the correct one.
Pelican Technical Article: Troubleshooting and Replacing the Boxster Mass Air Flow Sensor (MAF) - 986 / 987
If you determine that you need to replace your MAF, then this article will help you to figure out the correct one.
Steve