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Post pictures of your current car. In particular, get back more than 75 feet and take a side picture looking straight at the top of the rear window or c-pillar area, this way we can analyze the current aero shape of your rig. But in general, I'd guess this to be a bad idea what you want to do, it has to do with keeping your car as close to the ideal aero shape as possible, and making a drastic down angle in the back isn't usually a good thing. You may in fact want to put the spoiler back on.
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