Hi,
So far as my research goes, you could actually install this Engine in a '97, '98, or '99 Boxster. There were no changes to the Fuel, Exhaust, or DME Engine Management between these years. I suspect that Porsche produced these Model Years under the same, or re-issued, EPA Cert.
But, beginning in '00, there were substantial changes making the swap both illegal and impractical due to the e-Gas, DME, Exhaust and Fuel System Changes...
Happy Motoring!... Jim'99
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