I've worked on a few lowered cars that scrapped bumps and damaged their bumper covers.
It seems 4" will scrape regularly and 3" will scrape daily.
That said, if its lawn edging, etc., it will just flex out of the way and spring back.
One older large car (Buick?) if you let some air out of the bags then let off the gas hard and swerved over the line , the steel bumper would pop off the road reflectors ! Thats too low!
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