97z28 30th anniversary m6 full bolt ons full aftermarket UMI suspension and lowered on BMR Springs & Bilsteins.

When sitting still if I turn the wheel left/right I get a squeak that sounds like the tire rubbing on something, but I've checked clearance and nothing is rubbing at all or is even close to it. It's like a rubber on metal sound, what else could this be?

 

If you're running poly bushings on that aftermarket suspension and they have not been greased regularly then it will cause a squeak.