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Mark,
If it was the same 337 I saw a few years ago, the winglets are part of a gross weight increase kit which includes 3 ft. wing extensions, beefed-up landing gear and a fuel dump kit [I think].
If memory serves, it was a P337, and the owner wanted to make an honest 4-place plane out of it with full fuel. He may have increased gross weight in the order of 300#.
Paul
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Paul
T337C
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