aFe MagnumFORCE Intakes Stage-2 Si PG7 AIS PG7 GM Trucks 07.5-10 V8-6.6L (td) (See afe51-81332-E)aFe MagnumFORCE Intakes Stage 2 Si PG7 AIS PG7 GM Trucks 07. 5 10 V8 6. 6L (td) (See afe51 81332 E) Sealed, molded plastic or aluminum cover provides factory style with less intake noise than open systems. Our specially engineered air box openings pull cold air from outside the engine compartment increasing engine efficiency and producing greater performance gain. The cross linked polypropylene rotomolded plastic air box replaces restrictive stock air