[southernstar]

According to Porsche factory Technical Bulletins (reprinted on Pelican Parts techarticles under "Boxster Intermediate Shat Bearing Replacement and Upgrade"):

All 2.5's have double-row bearings.
All 2.7's had double row bearings until engine # M 651 12851
All 3.2's had double row bearings until engine # M 671 11237

Thereafter, some engines may still have had the double row bearings due to parts supplies. In addition, if the engines in the above cars were replaced by Porsche (or had the IMS, or timing chain replaced and 'updated' by Porsche) after the single row bearing was introduced, the earlier engine may have the 'updated' single row bearing.

The original single-row bearing apparently continued in use on all 2005 Boxsters and some 2006's when the larger bearing was introduced. Sorry, no engine numbers. In addition, the proposed class-action suit has more accurate numbers from Porsche for which the settlement is intended to apply (it does not apply to double-row bearings).

Brad