This Turbine Shaft Is Balanced And Ready To Be Used Right Out Of The Packaging. As With Any Turbo Rebuild, The Center Housing Rotating Assembly (CHRA) Will Need to Be Balanced, Engine Oil And Air Filter Must Be Changed, And Air Intake Tubes Leading To The Turbo Must Be Cleaned For A Successful Rebuild. Otherwise, The Turbo Will Fail Shortly After Rebuild Due To Pre-Existing Contaminants Interfering With The Turbo's 'Break-In' Process. Warranties Never Cover Improper Practices.