Insite:
FYI.
Blackstone claims 40 (forty) 2.5L Porsche engine samples in your data. And they throw out all data that's "really messed up from raced engines" so that data is not included in your universal averages.
They are now up to 85 (up from 80 in late 2010) Boxster 987S engines (3.2L) and 50 Turbo engines for the 993.
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