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Two things I've learned:
- There's just no way flow is going to be attached all the way down your rear window and trunk lid. Tuft test it and see. Smooth curve into to the rear glass or not, the angle is just too steep.
- There are not "massive" savings in Cd to be had simply using vortex generators. To really get the gains you are looking for you need to think about making a kammback.
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