Q: How much negative camber can these FUCA arms run?

A lot, more than almost anyone needs on the street. On our race car we maxed out at 5.8 degrees of negative camber on the race pill setting and 3.8 degrees on the street pill setting. For reference, our fastest race-slick setup uses about 4.0 degrees of front camber, which these handle easily. They can also go positive to offset a lifted, overlanding ride height. Actual limits shift with your ride height and spring or shock combination.