My understanding about the differences between US and non-US Porsches involves (at least during the 1980's)
1. US models required catalytic converters
2. US models could not have H4 high intensity headlights
3. The European models did not have the certain door reinforcements
I've also heard about the issue with Porsche not wanting to provide the 5 vehicles for crash testing. In addition, I believe that the sequential turbos in the 959 were forbidden.
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