Well, I haven't had time to build my tail, and I'm leaving Wednesday for New Jersey. I did get coroplast full pans on the front and rear of the car (with aluminum under the downpipe and catalytic converter in front after the plastic started melting!) and a couple panels in the middle to cover up the center tunnel. I'm also experimenting with 6 vortex generators on the rear window, after tuft testing without them, with 10, and then removing 4--they're keeping the flow attached now, but if they're having an effect on fuel economy, it's not significant enough to tell. I may try and fab up a temporary coroplast-and-tape box cavity tomorrow if I have time....
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