[husker boxster]

The build date is in the driver's door jamb. But it's only MM/YY.

Supposedly, rumor has it, don't quote me on this, I won't swear on a stack of Bibles, (I think that covers the disclaimer), Porsche had a supply of smaller bearing engines already built for the 2005 model yrs. Porsche ran their supply dry of smaller IMS engines somewhere in March 2005 and at that point started using the larger bearing IMS engines after that time. There are no records of when the change-over occurred so that's why it's speculation. I would hazard a guess if the In-Service date is late March, you would have the smaller bearing since the car had to be built, shipped, and in the dealer's inventory before the Mar 2005 cut-over.