When I was looking for a cool RWD car for IT I looked at the opel. From what I found none of the GT cars that I was able to locate had the 100 hp engine. All had the 80 something hp engine. Maybe I did not search well enough but it correlates to what wiki says.
"Opel reduced the compression ratio of the 1.9 L engine used in the US and output fell to 83 hp (SAE). "
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