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I think that graph may have come out of The 911 Story. I don't have the book handy, but what about drag of the Duck vs. Carrera/Early Turbo (non tea tray)? IIRC, Frere says overall Cd drops with the tails (vs. none) but I can't recall about diffs between tails.
I added a Carrera tail and front lip and could immediately feel the stability differences, but was thinking to shed some weight a fiberglass decklid with Duck would be the best compromise of weight loss with only minimal downforce loss.
Anyone know the drag numbers for each?
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'84 Carrera Coupe - B&B Headers and one-out muffler; K&N Cone intake; Steve Wong Chip; Euro height and corner balanced; 171K Miles (9/12)
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