I recently replaced the clutch and flywheel to a competition stage 2 and lighter flywheel now when ever I shift on high rpms it makes a bang noise even when I just floor it and let go st high rpms anyone had this problem and if you did what was he solution? I used royal purple for the oil n the tranny

 

Tough to diagnose problems like these.

First off,

Did you break-in the clutch per manufacturer specification?

Does the bang happen as you disengage the clutch to shift? Or as you let the clutch out?

Also, ensure all mounts, bolts, axles, and other fasteners are tight.