[autodoctor911]

according to scca street prepared rules engines, and or transaxles may be exchanged between a 2.5 boxster and a cayman S per section 15.1C:


C. Equipment and/or specifi cations may be exchanged between different
years and models of a vehicle if (a) the item is standard on the
year/model from which it was taken, and (b) the years/ models are
listed on the same line of Appendix A (Street Prepared Classes). The
updated/backdated part or the part to which it is to be attached may
not be altered, modifi ed, machined or otherwise changed to facilitate
the updating/backdating allowance. Standard factory installation
methods, locations, and confi gurations are allowed. The updating
and/or backdating of engines, transmissions, transaxles, and/or unibodies
must be done as a unit; component parts of these units may
not be interchanged. Cars not listed in the Street Prepared sections
of Appendix A may not be updated/backdated until approved by the
SEB and published in the offi cial SCCA publication.
D. Alternate computer control modules may be used whenever an
equivalent change to the conventional system is allowed. For example,
alternate computer module control of ignition settings or fuel
injection is allowed.
APPENDIX A - AUTOMOBILE CLASSES
...
STREET PREPARED CLASS B (BSP)
....
Porsche
911 (1965-89) (3.2L max, nonturbo)
928
Boxster & Cayman (all)

I actually think this is an oversight, and the 987-2 cars at least will be reclassified into ASP since in stock class they are in SuperStock, where as the 987s is in
A stock and the987 2.7 and 986 S is in B stock, and the lowly 2.7/2.5 986 is in C stock,