Injen Evolution Air Intake System 01-04 6.6L GM Duramax LB7 BD-1030050 The kit works with DFS780

The kit works with DFS780 and DFS780 PRO diesel fuel systems and easily plumbs into your engine's cooling system to warm the fuel to keep it from gelling in freezing temperatures

then these are the way to go

Cross Reference Part Number: F81Z9D930A

additional air filtration

and for good reason

Injen Evolution Air Intake System 01-04 6.6L GM Duramax LB7 BD-1030050 The kit works with DFS780The Evolution Air Induction system from Injen Technology offers your diesel guaranteed, safe horse power and torque gains with an easy installation. Simply bolt into your existing factory locations and enjoy new found power with your diesel. Made from quality cross link polyethylene for outstanding durability and insulation this system is a must have. The Injen Evolution Air Induction system is packed full of features not previously seen in diesel air