The cast intake horn on the Cummins is a known choke point. It not only makes performance gains but looks much better too.
Intake Horn For 2001-2004 GMC / Chevy 6.6L LB7 Duramax Diesel
Intake Horn For 2001-2004 GMC / Chevy 6.6L LB7 Duramax Diesel ASI
3'' Air Intake Elbow Tube Horn For 98.5-02 Dodge Ram 5.9L Cummins Diesel Silver
Jeep Wrangler TJ 1997-2006 4.0L, 6-cyl Air Filter Cleaner Box INTAKE HORN
Polished 3.5" Turbo Intake Horn Elbow Kit for 2017-2019 GM 6.6 6.6L L5P Duramax
Intake horn W/ cold side piping kit for 5.9L 12V Cummins 1994-1998 Ram 2500/3500
