The 981 is the only car I know of, where the convertible version costs less than the hardtop.
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I don't know if I agree the Boxster costs more to make. For one thing, the curb weights of the Boxster and Cayman are identical, which is unusual. Typically speaking, convertibles weigh more because they have increased structural support to compensate for the lack of a top. Depending on how extensive this is, it could increase manufacturing costs significantly. But the fact that both 981 models weigh the same lead me to believe there isn't much difference. Compare this against the Carrera where the cabriolet weighs ~150 lbs more than the coupe, and is priced higher as well.Boxster costs more to make the a compatible Cayman but Porsche can charges more for less and there are takers so they will do it.
And you are defining "superior" how?. The coupe layout is superior to the convertible (no disrespect to Boxsters here)... .
You've got the 981 and the 911 mixed up.Oh, one other point: Isn't the Cayman generally thought of as a more beautiful, more sexy looking car than the Boxster?
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