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There are some basic aerodynamic rules you have to stick to unless you have the means to test your diffuser in a wind tunnel. You don't need to cut out the spare tire well because the angle would be all wrong since the diff and suspension arms are in the way.
The way we made ours does give us the correct angle and we're able to get the surface area we wanted by extending it past the bumper. Does it work well? Yes! The car definitely felt more planted with just that change. We have a bunch of short clips on Instagram from the Ultimate Track Car Challenge but I haven't uploaded a full video yet.
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