Fits: 2001-2005 GMC & Chevy Trucks LLY, LB7 w/ 6.6L Duramax 

The FLO 823 by FLO-Pro is a 4" Cat Back exhaust system for the 2001-2005 GM Trucks with the 6.6L Duramax. Replace your restrictive OE components with a 4" aluminized system with a high-flow muffler. It not only sounds great but will improve your mileage, throttle response, and torque. It's designed to utlize all your exisiting OE hangers and fit like stock on GM trucks with the 4-bolt flange.

Features:

• 4" Cat-Back Single Exhaust system.
• Includes Muffler
• Aluminized Steel & Stainless Steel Options
• Single Side Exit
• Direct Bolt-in Application (4-Bolt Flange)

Part Number: FLO-823