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Old 03-20-2024, 09:10 AM   #2
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Join Date: Feb 2005
Location: It's a kind of magic.....
Posts: 6,286
The engine is definitely a factory reman due to the "AT" designation:

Engine serial numbers have 8 digits.

1st digit - No of Cylinders

2nd digit - Engine Version

3rd digit - Model Year

4th-8th digit - Serial Number

On a MY2005 Boxster the original engine would have the number 615*****.

Depending upon the year of reman, it could carry the oversized non serviceable bearing; the only real way to know for sure is to pull the flywheel and look at it, if it has the large 22MM center bolt nut, it is the oversized bearing.
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