WCFAB 2001-2004 LB7 Duramax Stage 3 High Flow Intake Bundle KitPowdercoat colors can be found here! WCFab 2001 2004 GM LB7 6. 6L Duramax Stage 3 High Flow Intake Bundle Kit Stage 3 upgrade for the 2001 2004 LB7 Duramax combines our Stage 1 High Flow Bundle, Stage 2 Intake Kit, a" Down Pipe into a single package providing increased airflow for your turbo and engine for improved efficiency, throttle response, and turbo spool up. This kit replaces the restrictive OEM LB7 Y Bridge, passenger side intercooler pipe,