2007.5-2010 LMM WCFAB 4" INTAKE KIT WITH AIR BOX (WCF100193)Upgrade your 2007. 52010 LMM Duramax with the WCFab 4" Intake Kit with Air Box (WCF100193), engineered for increased airflow, improved throttle response, and long lasting durability. This system replaces the restrictive factory intake with a large 4 inch fabricated aluminum intake tube, allowing your engine to breathe more efficiently and perform at a higher level. The fully enclosed air box is designed to reduce heat soak by pulling in cooler outside