2004.5-2010 Duramax LLY/LBZ/LMM Driver Side 3in Intercooler Pipe Banks Power

Banks' huge 3-inch boost tube. Stock tube is smaller diameter with tighter bends which hurts flow. Banks boost tube is 3-inch constant diameter mandrel-bent Aluminized Steel with larger radius bends. More air allows for more fuel which means more horsepower.