Wehrli 03-07 Dodge Cummins 5.9L 3.5in Intake Horn w/Driver IC Pipe - Illusion Purple2003 2007 5. 9L Cummins High Flow 3. 5" Intake Horn and Driver Side Intercooler Pipe Kit. Kit replaces the failure prone 3" plastic OEM intercooler pipe with a 3. 5" heavy duty 14g Aluminum intercooler pipe and the OEM cast intake horn, which is necked down to less than 1. 5" wide, with a full mandrel bent 3. 5" elbow. The 3. 5" elbow is welded to a CNC machined aluminum mounting flange (new hardware included) which perfectly matches the WCFAB Grid