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Nice! I think bumper extension could be fruitful on a lot of sports cars such as mine where the bumper barely pokes past the rear wheels. Adding a couple inches and pushing the edges out I think would create noticable gains. The 911 has a 0.29 drag coefficient vs. the Cayman/Boxster's 0.30 despite a more open bumper, more cooling, and a wider rear track/tires, and I would think that the extra couple of inches has something to do with it. Porsche cars would be hard to modify though, since the body slants downward well past the bottom of the rear hatch.
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