I don't know the condition of your Porsche, but I am sure you would be breaking even spending wise with just buying a Metro or a Civic. The swap would most certainly devalue any remaining worth in your car and be fairly labor intensive.
I forget what I was searching for exactly but about a month ago I came across someone willing to convert sports/super cars to hybrids he had a few pictures of Lambos, Ferraris and Porsches, but the cost was quite inhibitive- somewhere around $30k.
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