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A sports car is NOT for working. You and I are making two completely different analogies. Using more exotic and expensive light materials also drives cost out of control.Nonsense … quality materials properly designed will last just as long, if not longer, than simply bigger and heavier. Just look at the new crank, rods and pistons they are now making (like the stroker kit in my Mustang) that are far lighter and more durable than what was available in the past.