In the German language, the word Porsche would be pronounced with an unaccented schwa vowel on the end. Its not Porsh-uh, but it there would be a tiny almost imperceptable vowel following the Porsh part. If it were sung vocally in a song, the extra syllable is voiced completely, even written with its own note.
So, technically the correct pronunciation would be neither ways mentioned in this thread. Its neither Porsh nor Porsh-uh.
Here in the states where we have towns like:
North Versailles, PA (north ver-SALES)
Dubois, PA (DOO-boys - incedentally Michael Jackson's favorite town)
New Orleans (nu-WAH-lins)
I don't mind the "porsh" pronuciation. Most americans can't get the little subtleties of the European trailing syllabic vowels anyway, so if you can't do it right, leave it off.
