When Porsche replaced Boxster engines, what spec did they use?

[JFP in PA]

Originally Posted by Adrian Thompson

Hi, I'm going to look at a 99 base Boxster (worse than that, it's an auto!!!) that had a new Porsche engine fitted, buy Porsche in 2005. Since then It's done less than 20K miles.

What I want to know is what engine would Porsche themselves have fitted to a 99 Boxster in 2005? Would it be:
A: Early duel row IMS Bearing 2.5
B: Would it be a 2.5L but with the later single row bearing.
C: Would they have just used the then current engine which would be a 2.7 with a single row bearing.
D: Something else.

I'm hoping it's A actually as the single row IMS bearing seems to have a lower failure rate from what I can tell than the later duel row bearing?

Thanks

Porsche tended to match the engine specs to the original (yours would be a 2.5L engine), with some notable exceptions like installing the oversized non serviceable IMS bearings. Unfortunately, as yours is from the transitional year, the only way to know if it is the oversized bearing, or the more failure prone single row, is to pull it apart and look at the IMS center bolt; if it is a 22MM center bolt, you have the oversized bearing.