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Hi,
the most important angle is the one where the 'diffuser' meets the horizontal line - that should be as smooth as possible. In other words, if the end of the diffuser is quite steep, that might be OK as long as the point where it meets the flat underbottom is not. In other words, this: \____ (sharp angle) should be avoided at all costs. Also, in the closeup pic, you can see that the underside of the bumper is going to catch air instead of work like a diffuser. You have to take metal sheet and seal off the bottom of the car to get anything out of the setup.
It's a street car, and it's not nearly low enough to take advantage of ground effect anyway, so who cares if it works - it looks cool!
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