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Yes, when lowered enough the air can't fit under the car and has to go around/over.
Look at the ground clearance, 50MM/ 2". Let me know anywhere off track that that wouldn't scrape like mad.
Many states have a 4" min ground clearance law as well.
We experimented in my go-karting days with an adjustable "skirt" that basically rubbed the ground. picked up some aero benefit from it but every loose bolt or tire marble jammed under the durn thing.
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