Identify the Source of the Rattle

• Start by thoroughly inspecting the entire exhaust system. Use a flashlight and look for any components that might be loose or making contact with other parts.
• Check for any visible signs of wear and tear or physical damage that could be causing the rattle.

Check Exhaust Mounting Points

• Verify that all the exhaust hangers and mounting points are secure and in good condition. These can sometimes come loose or wear out, causing rattles.
• If any hangers are damaged or missing, replace them with new OEM or high-quality aftermarket hangers.

Tighten Bolts and Clamps

• Ensure that all bolts, clamps, and flanges along the exhaust system are properly tightened. Performance upgrades can sometimes lead to loose connections due to increased vibrations.
• Use a torque wrench to tighten bolts to the manufacturer’s recommended specifications, avoiding over-tightening which could damage components.

Add or Upgrade Exhaust Dampeners

• Consider installing additional exhaust dampeners or upgrading existing ones to better manage vibrations and reduce rattling.
• Products like exhaust band clamps, rubber hangers, or polyurethane bushings can help absorb vibrations and minimize noise.

Check for Clearance Issues

• After performance upgrades, the exhaust system might have shifted, leading to clearance issues with other components like the underbody, suspension, or subframe parts.
• Make sure there is adequate clearance all around the exhaust system, adjusting components as needed to prevent contact points.

Inspect and Adjust Heat Shields

• Heat shields are usually installed to protect other parts of the vehicle from exhaust heat but they can become loose and cause rattling noises.
• Inspect all heat shields to ensure they are securely fastened and not in contact with the exhaust system or other parts of the car. Tighten any loose fasteners or replace damaged heat shields.

Replace Worn Exhaust Components

• Over time, exhaust components such as gaskets, pipes, and mufflers can wear out, leading to poor fitment and rattles.
• Inspect these components for wear and replace any that are worn or damaged.

Seek Professional Help

• If you have thoroughly inspected and adjusted all the components and the rattling persists, consider taking your Corvette to a professional mechanic or exhaust specialist.
• They can conduct a more thorough inspection and have specialized tools and equipment to diagnose and fix the issue effectively.