With the Magnum FORCE Stage 1 intake system, AFE replaced the stock air box and the stock air filter.  By replacing the restrictive air box and air filter, there is a noticeable improvement in airflow and power. 

AFE Air Intake System Duramax 2001-2004 LB7:  $265.00 

The Magnum FORCE Stage 2 intake system replaces the entire stock air induction system to the turbo housing. In designing out the stock air box, AFE designed in the largest air box that they could.  Even though AFE makes it as large as possible, they are careful to use the stock mounting points.  There is no need to cut or drill anything when you install an AFE kit.  

AFE Air Intake System Duramax 2001-2004 LB7:  $295.00

AFE Air Intake System Duramax 2001-2004 LB7 Progaurd 7:  $350.00

With the Magnum FORCE Stage 1 intake system, AFE replaced the stock air box and the stock air filter.  By replacing the restrictive air box and air filter, there is a noticeable improvement in airflow and power. 

AFE Air Intake System Duramax 2004.5-2005 LLY:  $265.00

The Magnum FORCE Stage 2 intake system replaces the entire stock air induction system to the turbo housing. In designing out the stock air box, AFE designed in the largest air box that they could.  Even though AFE makes it as large as possible, they are careful to use the stock mounting points.  There is no need to cut or drill anything when you install an AFE kit.  

AFE Air Intake System Duramax 2004.5-2005 LLY:  $400.00

AFE Air Intake System Duramax 2004.5-2005 LLY Progaurd 7:  $450.00