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The big challenge I would expect from a flat underbody would be keeping it consistent front to back. If air starts spilling from the high pressure you low it's going to mess with any nice airflow you have.
Does a diffuser help drive clean airflow even if it's messy in places along the pan? 3 degrees is the lowest angle I've really heard of but most of my reading on the topic was fron motorsport, not exactly what you guys are going for but there's a lot of room for improvement in a stock car. Increasing downforce should increase drag, but I think reducing lift is another story. Increased stability and lower drag should be doable in most applications
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