If you are just going for looks don't worry about it. Most of the body kit I've look at don't show any test information. What you can do is use the tools and information we have like a flat spoiler extended out to the template will usually help. How does the one you are looking at fit under the template? How close to the ground is the front splitter or air dam. Does it have large opening or will it smoothly move air around to the sides.
Posting some front and side view picture may help with the discussion.
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